NASS Conference

[Fred Sawyer]

The annual conference of the North American Sundial Society will be held
June 8-11 this year in Ann Arbor MI (25 minute ride from the Detroit
airport).

The conference features a day and a half of interesting talks on sundials,
a full day bus tour of local dials, a visit to an observatory, and
announcement of this year's recipient of the Sawyer Dialing Prize.  This
year we mark 30 years of NASS and a century of the bifilar sundial.

For registration information, see
https://sundials.org/index.php/features/nass-conferences/365-register-now-for-nass-2023-conference.
If you have any general questions, email sundial.soci...@gmail.com
---
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NASS Sundial Course

[Fred Sawyer]

 The North American Sundial Society (NASS) is offering an introductory
course on sundials: Elements of Dialing.  The course will begin in
mid-January. Each lesson, sent by email, will have a number of questions
for students to answer for self-assessment. At the end of a week, answers
will be emailed and there will be a zoom video call to address any problems
and to show some additional items of interest.  Students will then have one
more week to submit answers to a final question; submission of an answer
will be required in order to obtain the next lesson.

This is an introductory course; it is free, but you must be registered. We
can accept a few more students for this session which will run from
mid-January through June.

Enroll by contacting Fred Sawyer at sundial.soci...@gmail.com
---
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Fwd: What does 'hectemoros' mean, as in Hectemoros Angle?

[Fred Sawyer]

-- Forwarded message -
From: Fred Sawyer 
Date: Sat, Jan 22, 2022 at 7:22 PM
Subject: Re: What does 'hectemoros' mean, as in Hectemoros Angle?
To: Steve Lelievre 


Steve,

Ptolemy introduced the hectemoros in his version of the analemma - a
graphical way to do an orthographic projection.  The hectemoros was a
circle in the heavens that shows up in the 2D graphical drawing as a
straight line representing either morning or afternoon.  This line was
divided into 6 hours - whence the name.

Fred


On Sat, Jan 22, 2022 at 7:02 PM Steve Lelievre <
steve.lelievre.can...@gmail.com> wrote:

> Hi,
>
> I'm looking for an etymological explanation of the word 'hectemoros' as
> used in gnomonics for the direct angle between the East (or West)
> Cardinal Point and the current position of the sun on the celestial sphere.
>
> I have scoured the Internet but the only meaning I can find relates to a
> class of person in ancient Greece - serfs who paid one sixth of their
> income as rent. Thanks in advance for information about the derivation
> as it relates to dialing.
>
> Regards,
>
> Steve
>
>
>
>
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
---
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Re: Construction method of early North American pewter dials

[Fred Sawyer]

Steve,

See the book at:

https://www.google.com/books/edition/Goldsmith_Chandlee_Sundial_Maker_Setting/iKfIDAAAQBAJ?hl=en=1=goldsmith+chandlee=frontcover


P.15 shows a photo of the brass mold used to make pewter dials.

Fred



On Sun, Oct 24, 2021 at 3:22 PM Steve Lelievre <
steve.lelievre.can...@gmail.com> wrote:

> Hi,
>
> My questions relate to the mass-produced cast pewter dials that were
> apparently commonplace in 18th and 19th century in North America. A 1762
> example is shown at
>
> https://digitalcollections.nypl.org/items/510d47d9-50fb-a3d9-e040-e00a18064a99#
>
> Were these dials normally cast as a single piece, as opposed to, for
> example, the dial face and gnomon being cast separately and then
> soldered together? Are any molds known to have survived? If so, where held?
>
> Sunny days,
>
> Steve
>
>
> ///workers.exist.lookout
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
> --
Fred Sawyer
///paused.notify.dial
---
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NASS meeting blogged

[Fred Sawyer]

See http://spacewatchtower.blogspot.com/ for a blog on the recent NASS
conference in Pittsburgh.  Glenn Walsh, the author, was with us throughout
most of the sessions.  Despite a few small errors in the report, it gives
NASS some good coverage.
---
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Re: blank subject line

[Fred Sawyer]

Doug

The irony is that your email arrived without a subject line.  Take note of
Steve Lelievre's earlier email.

When emails are not DMARC compliant the system wraps them into another
email and sends it via sundial with no subject.

Fred




On Tue, May 22, 2018, 2:01 PM Douglas Bateman via sundial <
sundial@uni-koeln.de> wrote:

> Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die
> eigentliche Nachricht steht dadurch in einem Anhang.
>
> This message was wrapped to be DMARC compliant. The actual message
> text is therefore in an attachment.
>
>
> -- Forwarded message --
> From: Douglas Bateman 
> To: Willy Leenders 
> Cc: Eric Daled , Sundial list  >
> Bcc:
> Date: Tue, 22 May 2018 19:01:26 +0100
> Subject: Re: Blank subject line
> Regardless of the technical stuff and suspicion, I regard a subject line
> as a simple courtesy!
>
> Best wishes, Doug
>
> > On 22 May 2018, at 18:02, Willy Leenders 
> wrote:
> >
> > Why that suspicion?
> > The mention of a subject does not guarantee reliability and the absence
> of a subject is not a sign of unreliability.
> >
> > Willy Leenders
> >
> >
> >
> > Op 22-mei-2018, om 17:00 heeft Eric Daled het volgende geschreven:
> >
> >> And I agree also : I always delete such messages.
> >>
> >> Eric
> >>
> >>
> >> -Oorspronkelijk bericht- From: Roger W. Sinnott Sent: Tuesday,
> May 22, 2018 4:33 PM To: sundial@uni-koeln.de Subject: RE: Blank subject
> line
> >> I agree with Helmut!
> >> When I see a blank subject line, I become suspicious and often just
> delete
> >> the message without opening it.
> >>
> >> Roger
> >>
> >>
> >> -Original Message-
> >> From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Helmut
> >> Haase
> >> Sent: Tuesday, May 22, 2018 10:11 AM
> >> To: sundial@uni-koeln.de
> >> Subject: Blank subject line
> >>
> >> Hallo gnomonicist,
> >> It seems to become a trend here to send mails without subject
> information.
> >>
> >> Is it difficult to write a subject line?
> >>
> >> Regards
> >>
> >> Helmut Haase
> >>
> >>
> >>
> >> ---
> >> https://lists.uni-koeln.de/mailman/listinfo/sundial
> >>
> >> ---
> >> https://lists.uni-koeln.de/mailman/listinfo/sundial
> >>
> >> ---
> >> https://lists.uni-koeln.de/mailman/listinfo/sundial
> >>
> >
> > 
> >
> > Bezoek mijn webstek met alle zonnewijzers in Limburg (Vlaanderen) en een
> rubriek (zonne)wijzerweetjes: http://www.wijzerweb.be
> >
> > ---
> > https://lists.uni-koeln.de/mailman/listinfo/sundial
> >
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
---
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Re: Dutch sundial journal renewed

[Fred Sawyer]

Congratulations Frans and Eric on developing this collaboration!

Thank you also for the wonderful tribute to Fer deVries that is available
on your website.

Fred Sawyer


On Sun, May 6, 2018 at 9:36 AM, Maes, F.W. <f.w.m...@rug.nl> wrote:

> Dear sundial friends,
>
>
>
> This is to let you know that the Sundial Society of Flanders (Belgium) has
> discontinued the publication of "Zonnetijdingen", as it appeared
> increasingly difficult to gather enough articles.
>
> The Belgian Society contacted the Netherlands' Sundial Society (De
> Zonnewijzerkring), which has been publishing its "Bulletin" for 40 years
> already.
> The two societies decided to join editorial forces in a new journal, *ZON
> & TIJD* (Sun & Time).
>
> The fact that Dutch is the common language of both societies made this an
> easy choice.
>
> Our Austrian friends may note some similarity with the title of their
> journal, “Sonne + Zeit”. We hope they take this as a compliment J
>
> You may have a look at the first issue, which has articles by Dutch and
> Flemish authors. The issue is temporarily available from the English
> section of the new website of De Zonnewijzerkring, at:
>
> *www.dezonnewijzerkring.nl/pages/en/downloads.php
> <http://www.dezonnewijzerkring.nl/pages/en/downloads.php>. *The journal
> is in Dutch, of course, but features an English summary of the contents in
> the back on p. 37-38.
>
>
>
> Best regards,
> Frans Maes (NL) & Eric Daled (BE), editors
>
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>
---
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Re: Golden Ratio and Sundials

[Fred Sawyer]

In 1997, I presented the following problem in The Compendium:

Problem:  It is required to know in what Latitude of this terraqueous
Globe, an Erect South Declining Dial might be fixed to have these
Properties, viz. the Declination of the Plane, the Distance of the Substyle
from the Meridian, and the Style’s height [are] all equal.

The problem originated with Edward Hauxley in a challenge issued to Charles
Leadbetter Feb. 1, 1736/7.  Leadbetter struggled with the solution,
developing a 4th degree polynomial whose solution gave him a value for the
declination.  He then fit this value into other equations to come up with a
slightly different value for the latitude.

The correct solution is that the latitude is 38d 10m 22s and that this is
also the value of the other angles sought.  The solution involves finding
that the sine of the required latitude is the reciprocal of the golden
ratio.

To see the article, download it at:
https://www.dropbox.com/s/bj2qk6s1hg3a5m2/Pages%20from%20Nass43.pdf?dl=0

Fred Sawyer


On Wed, Jun 21, 2017 at 5:04 PM, rodwall1...@gmail.com <
rodwall1...@gmail.com> wrote:

> Hi all,
>
> I have been reading a book on the Golden Ratio which is 1.6180339887. It
> describes how the Golden Ratio describes how the spiral of a sea shell is
> produced. And how nature uses the Golden Ratio on the size of leaves etc.
>
> Does anyone know if sundials have ever been produced useing the Golden
> Ratio. The Golden Ratio goes back in history so one wonders if it was ever
> applied to sundials.
>
> The book describes that the short and long sizes of credit cards are close
> to being the Golden Ratio.
>
> LongSide/ShortSide = Golden Ratio.
>
> Regards,
>
> Roderick Wall.
>
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>
---
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Gianni Ferrari

[Fred Sawyer]

The Minor Planet Center at the Smithsonian Astrophysical Observatory has
named asteroid n. 315046 after amateur astronomer and sundialist Gianni
Ferrari.


*Gianni Ferrari (b. 1938) is the founder of the Modena Amateur Astronomers
Group. He has given many lectures and written several articles and computer
programs and also two books about sundials calculation*


Gianni was informed that one of the factors leading to the decision was his
receiving the Sawyer Dialing Prize from NASS a couple years ago.


For more info, see  https://ssd.jpl.nasa.gov/sbdb.cgi  Enter as Name
315046  or   “Gianniferrari” .

With the "Orbit Diagram" option you can see the orbit
---
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Re: Golden Ratio and Sundials

[Fred Sawyer]

Traveling now so I don't have access to it at the moment, but several years
ago I published a quiz in The Compendium that had the golden ratio as the
answer.   It's was an actual historical example and the author back in the
17th? Century wasn't aware that the number he was approximating was phi.
Readers who have the (fantastic) NASS Repository. DVD can do an  easy
search to find the quiz.



On Jun 22, 2017 3:31 PM, "Donald L Snyder"  wrote:

Thanks, Michael, for setting that right.  I would add only that the golden
ratio
equals (sqroot(5) + 1)/2, which is a number approximately equal to 1.61803.
The inverse of the golden ratio is approximately 0.61803.
  The original question posted by Roderick asked if the golden ratio could
ever apply to a sundial.  I see nothing obvious except these trivial
possibilities.  One could certainly construct a sundial on a rectangular
plate having a long side to short side ratio that is golden.  A
second possibility has the golden ratio pretty much hidden.  Since
atan(1.61803) equals 58.28 degrees, a horizontal sundial in a city at
this latitude could have a triangular gnomon with a height to base
ratio that is golden.
   Don Snyder



On 6/21/2017 10:00 PM, Michael Ossipoff wrote:



On Wed, Jun 21, 2017 at 5:27 PM, Brooke Clarke  wrote:

> Hi Roderick:
>
> I also have a book on this number that makes the case that there is no
> such ratio.
>


Your book is mistaken.

If A/B = (A+B)/A, then A/B is the golden ratio.

If a line-segment is divided into two parts related by that ratio, then the
golden ratio is also called the golden section.

If the interval between two numbers is divided into two intervals related
by the golden ratio, then the golden ratio is also called the golden mean.



> For example if you look at a photograph of something where do you put the
> markers to make the measurement?
>

Along two mutually-perpendicular edges, measured from a common corner?  :^)


Michael Ossipoff



> Brooke 
> Clarkehttp://www.PRC68.comhttp://www.end2partygovernment.com/2012Issues.html
>
>  Original Message 
>
> Hi all,
>
> I have been reading a book on the Golden Ratio which is 1.6180339887. It
> describes how the Golden Ratio describes how the spiral of a sea shell is
> produced. And how nature uses the Golden Ratio on the size of leaves etc.
>
> Does anyone know if sundials have ever been produced useing the Golden
> Ratio. The Golden Ratio goes back in history so one wonders if it was ever
> applied to sundials.
>
> The book describes that the short and long sizes of credit cards are close
> to being the Golden Ratio.
>
> LongSide/ShortSide = Golden Ratio.
>
> Regards,
>
> Roderick Wall.
>
>
>
> ---https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>


---https://lists.uni-koeln.de/mailman/listinfo/sundial



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---
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Re: Re[2]: St. Hildevert

[Fred Sawyer]

Dialists should be familiar with chronograms - for those position doesn't
matter - you just add the letters together.  Or it could just be a typo.
Take your pick!



On Sat, May 27, 2017 at 12:07 PM,  wrote:

> <>
>
> In the VXII th??
>
> Mike Shaw
>
>
>
>
>
---
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Re: St. Hildevert

[Fred Sawyer]

Hildevert is a Catholic saint - recognized primarily in the north-central
region of France, but he once also had a following in England.  He probably
had nothing to do with dialing.  There are a number of 'saints' who had
some interest in sundials, but that's not what I was primarily interested
in.  What I wanted was to find a patron saint who, at some point in
history, was adopted as such by an identifiable group of dialists.  From my
perspective, an established tradition is of more interest than trying to
justify any new assignment.   Hildevert was the official patron saint of
French workers in lace and ivory.  Given the ivory sundial industry in
France, French dialists adopted him as their patron.

As I often point out - this sort of information would be familiar to those
who subscribe to The Compendium!  You can read two very brief articles on
Hildevert by downloading the file:

https://www.dropbox.com/s/xuwfyzw2065ps6n/Hildevert.pdf?dl=0

Fred


On Sat, May 27, 2017 at 9:38 AM, Eric Daled <eric.da...@telenet.be> wrote:

> Hi Fred,
> Can you tell us a little bit more about this man ?
> As far as I know (from Wikipedia ;-) he was a French ecclesiastic, bishop
> of Le Mans, etc... but nothing about any gnomonistic activity.
> Regards,
> Eric Daled
>
>
> (iPad)
>
> > Op 27 mei 2017 om 15:04 heeft Fred Sawyer <fwsaw...@gmail.com> het
> volgende geschreven:
> >
> > Happy St. Hildevert's Day - patron saint of dialists.
> > ---
> > https://lists.uni-koeln.de/mailman/listinfo/sundial
> >
>
>
---
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St. Hildevert

[Fred Sawyer]

Happy St. Hildevert's Day - patron saint of dialists.
---
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Capuchin and Regiomontanus dials

[Fred Sawyer]

Take a look at A.W. Fuller's article Universal Rectilinear Dials in the
1957 Mathematical Gazette.  He says:

"I have repeatedly tried to evolve an explanation of some way in which
dials of this kind may have been invented.  Only recently have I been
satisfied with my results."

The rest of the article is dedicated to developing his idea.

Note that it's only speculation - he can't point to any actual historical
proof.  That's the problem with this whole endeavor; there is no known
early proof for this form of dial - either in universal or specific form.
(It seems that the universal form probably came first.)

It was published in 1474 by Regiomontanus without proof.  He does not claim
it as his own invention and in fact refers to an earlier unidentified
writer.  There has been speculation that he got it from Islamic scholars -
but nothing has been found in Islamic research that would qualify as a
precursor.  The dial is somewhat similar to the navicula that may have
originated in England - but that dial is only an approximation to correct
time.

In discussing this history, Delambre says:

"All the authors who have spoken of the universal analemma, such as
Munster, Oronce Fine, several others and even Clavius, who demonstrates all
at great length, contented themselves with giving the description of it
without descending, as Ozanam says, to the level of demonstration."

"At this one need not be surprised, seeing that it rests on very hidden
principles of a very profound theory, such that it seems that it was
reserved to [Claude Dechalles] to be able to penetrate the obscurity."

So Dechalles gave what was evidently the first proof in 1674 - 200 years
after Regiomontanus' publication.  But as Delambre further notes:

Dechalles’ proof … is long, painful and indirect, … without shedding the
least light on the way by which one could be led to [the dial’s] origin.

So - pick whichever proof makes sense for you.

Fred Sawyer
---
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Re: Sundial Gnomon Design contest

[Fred Sawyer]

 Gnomon Design Contest
[image: Gnomon Greek pronunciation and definition]

The Washington State Department of Enterprise Services invites student
designers to create a design for a functional
,
accurate
,
and aesthetic gnomon for the state's Capitol Campus sundial.

*Entries due by February 24 2017, 5 p.m.*

*Notice of Award for winning design – March 10*
- *To be eligible, you must be enrolled in a Washington State community or
technical college.*
- *Student teams are encouraged.*

*An honorarium of $1,000 will be awarded for the winning design*



*Details at:
http://des.wa.gov/services/facilities-leasing/capitol-campus/memorials-and-artwork/territorial-sundial/sundial-gnomon-design-contest
*
---
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Sundial Gnomon Design contest

[Fred Sawyer]

 Gnomon Design Contest
[image: Gnomon Greek pronunciation and definition]

The Washington State Department of Enterprise Services invites student
designers to create a design for a functional
,
accurate
,
and aesthetic gnomon for the state's Capitol Campus sundial.

*Entries due by February 24 2017, 5 p.m.*

*Notice of Award for winning design – March 10*
- *To be eligible, you must be enrolled in a Washington State community or
technical college.*
- *Student teams are encouraged.*

*An honorarium of $1,000 will be awarded for the winning design*


*Details at:
http://des.wa.gov/services/facilities-leasing/capitol-campus/memorials-and-artwork/territorial-sundial/sundial-gnomon-design-contest
*
---
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Re: Double analemma dials

[Fred Sawyer]

Hi Fabio

This use of an analemma design on the analemmatic dial has been a confusing
error that goes back at least to the early 20th century introduction of the
curve on the dial in Brou, France.  The use of a double analemma design
with curves calculated to limit error to just a few minutes throughout the
year goes back at least to 1970 and the work of Ken Seidelman at Longwood
Gardens in Pennsylvania.  For a detailed discussion with equations, etc.
see my article "Of Analemmas, Mean Time and the Analemmatic Sundial" that
you can download at https://dl.dropboxusercontent.com/u/4837615/scia7.pdf
Brian Albinson has taken this idea to heart and, using a slightly different
approach to the equations, has designed several such dials in the Vancouver
area.

Fred Sawyer

On Tue, Aug 16, 2016 at 12:23 PM, fabio.savian <fabio.sav...@nonvedolora.it>
wrote:

>
> hi all,
>
> I draw inspiration from the image sent by Brian Albison for a meditation.
>
> I often found analemmatic sundials with the analemma. Has it a sense ?
>
> Standing on the analemma one can get the right correction for eot only at
> noon.
> Most of these sundials don't report a warning about it, so the users get a
> wrong time al the day, except noon.
> Moreover some of them haven't the calendar on the meridian line but only
> on the analemma, so the misunderstanding is sure.
>
> The use of a table with the eot should solve the curiosity to get the mean
> time, so I wonder why this kind of sundial is knowspreading with the
> analemma while it is not suitable for this.
> Do you  where this use come from ?
>
> ciao Fabio
>
> Fabio Savian
>
> Inviato da Tablet Samsung.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>  Messaggio originale 
> Da: Brian Albinson <brianalbin...@shaw.ca>
> Data: 16/08/2016 18:04 (GMT+02:00)
> A: Sundial Group <sundial@uni-koeln.de>
> Oggetto: Double analemma dials
>
> Hi folk
>
> We have built 3 direct reading mean time double analemma dials,
> (including the Highlands School dial) in the Vancouver area and are
> curious to know if any others exist in the world (apart from the
> Longwood dial).
>
> Brian Albinson
>
> Len Berggren
>
> Vancouver, Canada
>
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>
---
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Re: Looking for a sundial 'twin': wide gnomon spider - second try with smaller photo NUMBER 2

[Fred Sawyer]

I recall seeing a similar design in an early 20th century Popular Mechanics
or Popular Science - one of those.

Fred Sawyer

On Thu, May 26, 2016 at 12:51 PM, Kevin Karney <kar...@me.com> wrote:

>
>
> Begin forwarded message:
>
> *From: *Kevin Karney <kar...@me.com>
> *Subject: **Re: Looking for a sundial 'twin': wide gnomon spider - second
> try with smaller photo NUMBER 2*
> *Date: *26 May 2016 at 17:50:46 BST
> *To: *Helmut Haase <helmut.ha...@teleos-web.de>
>
>
> On 23 May 2016, at 18:54, Helmut Haase <helmut.ha...@teleos-web.de> wrote:
>
> Hi,
> I have designed and realized a horizontal spider sundial with polar pointing
> wide gnomon, see details below and photo (in a second approach sadly reduced
> to 47 kB now). *Does anyone know **s**uch a sundial* *anywhere else?* I
> found many spider sundials but none with a *wide* polar gnomon. A photo
> link or any other information would be great?
>
>
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>
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Re: Horary machine

[Fred Sawyer]

Stanislav - that's exactly right.  It's extremely frustrating to find a
scan that gives the text but does not reproduce the graphic.

Fred

On Mon, Feb 29, 2016 at 10:32 AM, Putowsky <putow...@yahoo.com> wrote:

> Hello Fred.
> Thank you very much for your very accurate answer.
> It is a shame that the guys from Google Books doesn't know how to digitize
> books.
> They mutilate allways the most important pages for a gnomonist, the images.
> It only cost a little bit more of time to digitize also the prints!.
> At least the books digitized by Microsoft have text and also the prints.
> The guys from Google didn't realized that a book digitized in the way they
> do is worth almost for nothing?
> May be somebody can tell them to do a well done digitized copy?
>   Stanislav Putowsky.
> putow...@yahoo.com
>
> On 27 feb 2016, at 19:48, Fred Sawyer <fwsaw...@gmail.com> wrote:
>
> This is a print from Pluche's Spectacle de la Nature.  For an English
> translation of this book, see
>
>
> https://books.google.com/books?id=FOI4MAAJ=horary+machine=gbs_navlinks_s
>
> The machine is described on p. 212 and following.
>
> Fred Sawyer
>
>
> On Sat, Feb 27, 2016 at 9:14 AM, Dan-George Uza <cerculdest...@gmail.com>
> wrote:
>
>> Hello!
>>
>> An old print depicting a "horary machine" is being sold on E-bay. Can you
>> please tell me what it is and how it works?
>>
>> 
>>
>>
>> http://www.ebay.com/itm/1766-PLUCHE-Horary-Machine-Ring-Dial-Sundial-Antique-Engraving-/291691633308?hash=item43ea2d1a9c:g:9nUAAOxyrrpTgZSe
>>
>> Thanks!
>>
>> Dan
>>
>> ---
>> https://lists.uni-koeln.de/mailman/listinfo/sundial
>>
>>
>>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Horary machine

[Fred Sawyer]

This is a print from Pluche's Spectacle de la Nature.  For an English
translation of this book, see

https://books.google.com/books?id=FOI4MAAJ=horary+machine=gbs_navlinks_s

The machine is described on p. 212 and following.

Fred Sawyer


On Sat, Feb 27, 2016 at 9:14 AM, Dan-George Uza <cerculdest...@gmail.com>
wrote:

> Hello!
>
> An old print depicting a "horary machine" is being sold on E-bay. Can you
> please tell me what it is and how it works?
>
> [image: Inline image 2]
>
>
> http://www.ebay.com/itm/1766-PLUCHE-Horary-Machine-Ring-Dial-Sundial-Antique-Engraving-/291691633308?hash=item43ea2d1a9c:g:9nUAAOxyrrpTgZSe
>
> Thanks!
>
> Dan
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: A Happy Leap Year Day to everyone

[Fred Sawyer]

Frank,

Happy Leap Day.  I have shared your Power poibt file on this with ny
daughter so she dan use it in the Latin classes she teaches.  She is having
parties in each of the classes today.

Best wishes,

Fred

On Wednesday, February 24, 2016, Frank King  wrote:

> Dear All,
>
> As is my four-yearly custom, I wish readers of
> this list a Happy Leap Year Day.
>
> I was delighted, in 2012, when I sent out a
> similar greeting, that not a single reader
> queried why I had sent out the message on
> 24 February.
>
> I will add my four-yearly lament that the
> perfectly good English term "bissextile year"
> seems to be almost obsolete.  Around 100 years
> ago it was in fairly common use.
>
> I continue to applaud the French, the Italians
> and the Portuguese (just to give three examples)
> who still use année bissextile, anno bisestile
> and ano bissexto.
>
> Let us hope that they do not indulge in the
> dumbing-down from which we in the U.K. seem
> to suffer.
>
> Frank King
> Cambridge, U.K.
>
>
>
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Mass Dial encyclical

[Fred Sawyer]

John,




See p.22 of the Introduction to Gatty's Book of Sun.dials.  







Fred Sawyer






—
Sent from Mailbox

On Sat, Aug 1, 2015 at 9:03 AM, Fred Sawyer fwsaw...@gmail.com wrote:

 John,
 Mrs. Gatty claims this was a decree of Pope Sabinian, 606 AD.  Away from 
 home, so I can't give you a page reference.
 Fred
 —
 Sent from Mailbox
 On Sat, Aug 1, 2015 at 6:26 AM, John Foad john.f...@keme.co.uk wrote:
 I have heard that there was once a Papal Encyclical requiring all churches 
 to have a Mass Dial.  Is there any truth in this, and if so do we have a 
 reference to it?
 John Foad---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Mass Dial encyclical

[Fred Sawyer]

John,




Mrs. Gatty claims this was a decree of Pope Sabinian, 606 AD.  Away from home, 
so I can't give you a page reference.




Fred



—
Sent from Mailbox

On Sat, Aug 1, 2015 at 6:26 AM, John Foad john.f...@keme.co.uk wrote:

 I have heard that there was once a Papal Encyclical requiring all churches to 
 have a Mass Dial.  Is there any truth in this, and if so do we have a 
 reference to it?
 John Foad---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Korean paper sundial

[Fred Sawyer]

You can find the Korean 3D puzzle sundial at:

http://www.amazon.com/Jigsaw-3D-Puzzle-History-Series/dp/B00CL1UZWE

Fred Sawyer


On Sat, Mar 28, 2015 at 5:07 AM, Darek Oczki dhar...@o2.pl wrote:

 Hi Hal
 Interesting question, isn't it? :) It seems to me this freefeelmarket is
 the username of an eBay seller.
 My guess is he is the one to ask. You try reaching him through his
 profile: http://stores.ebay.com/freefeelmarket
 --
 Best regards
 Darek Oczki
 52N 21E
 Warsaw, Poland

 GNOMONIKA.pl
 Sundials in Poland
 http://gnomonika.pl


 Dnia 27 marca 2015 22:22 Hal Brandmaier hal2d...@gmail.com napisał(a):

   Hi Darek!

 Where do I write to get one of the Korean sundials?

 Thanks, Hal Brandmaier

 On Fri, Mar 27, 2015 at 1:29 PM, Darek Oczki dhar...@o2.pl wrote:

 Hello everyone

 I remember here a conversation about paper or cut-out sundials. This is
 what I just found:

 http://www.freefeelsoul.com/2014/04/15/paper-toy-scale-model-kit-kids-adult-scholas-paper-world-sundial/

 --
 Best regards
 Darek Oczki
 52N 21E
 Warsaw, Poland

 GNOMONIKA.pl
 Sundials in Poland
 http://gnomonika.pl
 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial


 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial



---
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Re: Clouding the issue

[Fred Sawyer]

See Wheatstone's Polarizing Sundial by Jim Mahaffey in The Compendium
8(2):1-3, Jun 2001.  This is an expanded version of his article that first
appeared in Optics and Photonic News, 11(7):14-15, Jul 2000.

Fred


On Mon, Mar 30, 2015 at 12:24 AM, Roger Bailey rtbai...@telus.net wrote:

  Hello Peter and all,

 Yes, clouds are a significant, perhaps the overwhelming issue with
 sundials. Night knocks out half the time and clouds at least half of the
 remaining daylight hours. Our BSS colleagues know the problem. The most
 common sundial motto is I count only the sunny hours. This is a truly
 defeatist attitude in these days of technology. Can we do better? The
 effects of clouds are subtle. A slight overcast can destroy the contrast
 required to read a sundial. Such sunlight, not enough to cast shadows can
 burn pale skin. Fleeting clouds cause the shadow to bounce back and forth
 giving indeterminate time readings depending on the side of the sun
 obscured. I don't think wavelengths are the solution. Wavelength effects
 giving us red sunsets but there seems to be no advantage through daytime
 clouds. But where there is light, there is hope. Polarization is detectable
 through light clouds. Take that old polarizing filter from your obsolescent
 SLR camera or an old pair of Polaroid sunglasses, hold towards the sun and
 turn to see the polarization of the sky. Direct views of the sun are not
 required. Polarized skylight can tell you where the sun is when it is
 obscured. The polarization effect is evident but not distinct. The
 phenomenon exist and is familiar to photographers with polarizing
 filters, a vanishing species. Has the effect been exploited by gnomonists?
 I don't think so. The opportunity remains, a chimera, like analemmatic
 moondials. I am working on the latter for the NASS conference in Victoria
 BC in June.

 Regards, Roger Bailey

  *From:* Peter Mayer peter.ma...@adelaide.edu.au
 *Sent:* Sunday, March 29, 2015 3:13 PM
 *To:* sundial@uni-koeln.de
 *Subject:* Clouding the issue

 Hi,

 In the Last Word section of a recent _New Scientist_ Stephen Parish
 raised the question of sundials that might work on cloudy days...Clearly,
 polarisation is possible, but I'm doubtful about shadow casting...
 Clouding the issue

- 18 March 2015
- Magazine issue 3013 http://www.newscientist.com/issue/3013. *Subscribe
and save*

 http://subscription.newscientist.com/bundles/bundles.php?promCode=8014packageCodes=PTAofferCode=Qcmpid=nsarticletopintcmp=SUBS-nsarttop
- For similar stories, visit the *Last Word*
http://www.newscientist.com/topic/lastword Topic Guide

 *Are there any wavelengths at which the sun still casts a shadow when the
 sky is full of clouds? Could I make a sundial that would work on a cloudy
 day?*

 *Stephen Parish, London, UK*

 *This article appeared in print under the headline Clouding the issue*
 [image: Issue 3013 of New Scientist magazine]
 http://www.newscientist.com/issue/3013

- From issue 3013 http://www.newscientist.com/issue/3013 of New
Scientist magazine, page 57.

 best wishes,

 Peter

 --
 Peter Mayer
 Department of Politics  International Studies (POLIS)
 School of Social Scienceshttp://www.arts.adelaide.edu.au/polis/
 The University of Adelaide, AUSTRALIA 5005
 Ph : +61 8 8313 5609
 Fax : +61 8 8313 3443
 e-mail: peter.ma...@adelaide.edu.au
 CRICOS Provider Number 00123M
 ---

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Re: sundial village in Italy (near San Marino?)

[Fred Sawyer]

Claude,

See Gianni Ferrari's article Sundials with a double system to show the
hours in the December 2006 issue of The Compendium.

Fred


On Mon, Feb 16, 2015 at 1:41 PM, Claude Hartman 
sunlightdesi...@earthlink.net wrote:

  What an extraordinary sundial village! The number must certainly be the
 result of the Aiello sundial Project?  does a report on this project
 exist in English? I noticed several years of competition.

 I was most struck by the number and great application of *reflecting*
 sundials.  Not only are there reflecting dials on north facing walls but
 some are used to extend the hours served on highly declining walls as
 well.  When properly done as shown, the same hour lines can be used for the
 reflected spot or shadow of the mirror.

  This is certainly worthy of a report in of itself.  Is there one?

 Claude Hartman
 35N  120W

 On 2/14/2015 3:34 AM, Darek Oczki wrote:

 Hi Woody

 That's not all - there is another sundial village (or perhaps a small town) 
 in Italy: Aiello del Friuli (about 120 km from Venice). Here is a map from 
 the official website in English:
 http://www.ilsoleeiltempo.it/mappaeng.htm

 The town on GoogleMaps
 https://www.google.com/maps/place/33041+Aiello+del+Friuli+UD,+W%C5%82ochy/@45.875649,13.3502407,14z/data=!4m2!3m1!1s0x477ba545862575c9:0x4d6ef7275b878022?hl=pl

 According to their register they have got nearly a 100 dials there.

 Hope this helps



 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial



---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Prepublication info on a new book on sundials/dialing

[Fred Sawyer]

Greetings from NASS.

The December issue of The Compendium will include a review of Denis
Savoie's new (French) book Recherches sur les cadrans solaires.  This
hardbound book devotes its 240 pages and 170 color illustrations to
analyzing several historic sundials ranging from antiquity to the present
day.

Unfortunately, the publisher's special sale price, which offers a discount
of better than 15%, is valid only until October 31 - so it will expire well
before the review is published.

If you would like early info on the book (in French) so that you can take
advantage of the sale price, you can check with the publisher at brepols.net
.

Regards,

Fred Sawyer
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Fwd: Heinz Schumacher

[Fred Sawyer]

Doug,

The second volume is by Adolf Peitz; it consists of tables and diagrams
giving details on how to lay out out a variety of dial types at different
latitudes.  From my perspective, the least interesting of the volumes.

The third volume is by Schumacher and Peitz together.  It consists of 303
b/w photos of dials - each with a brief description of the dial.  I've
always enjoyed this one for the photos of some interesting, diifferent
dials.

At least the first and third volumes are currently available on the used
book market.  See for example:

http://www.booklooker.de/app/result.php?titel=Sonnenuhren+%3A+eine+Anleitung+f%FCr+Handwerk+und+Liebhaber+-+setMediaType=0


Fred




On Thu, Sep 25, 2014 at 1:54 PM, Douglas Bateman 
douglas.bate...@btinternet.com wrote:

 I am hoping for some information about this author of sundial books. I
 have a copy of Sonnenuhren, Eine Anleitung für Handwerk und Liebhaber,
 Callway, München, 1973.

 An excellent and well illustrated book, and I believe that other volumes
 followed.

 I would be grateful if members of the list could confirm this, and perhaps
 supply some facts about Schumacher, such as where he taught, brief
 biographical details, etc.

 Regards, Doug
 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial


---
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June Compendium

[Fred Sawyer]

The June issue of The Compendium is out (or soon will be!).

This issue includes an article by Jeffrey Kretsch:  Sundials For Indicating
Ultraviolet Exposure.

One of the references Jeff cites at the end of his article was printed
incorrectly.  It should be:
http://www.wunderground.com/resources/health/uvindex.asp


Fred Sawyer
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Sundial dedication

[Fred Sawyer]

Note the following news of a sundial dedication.  Congratulations to Bill
Gottesman.

Fred Sawyer
--

LBWCC sundial dedication is April 27

LBW Community College will hold a dedication ceremony for a
recently-acquired sundial on the Andalusia campus. The event will be
attended by both the sundial benefactor, Renis O. Jones Jr. of Montgomery,
and artistic designer/creator Bill Gottesman of Burlington, VT. This event
is free and open to the public. A reception will follow the event.
WHO: LBW Community College, 1000 Dannelly Blvd., Andalusia, AL
WHAT: Dedication of a newly-placed sundial on campus, followed by a
reception.
WHEN: Sunday, April 27, 2014, 3 p.m.
WHERE: At the sundial on the Andalusia campus (located in the open area
between the George C. Wallace Administration Building and the William H.
McWhorter Learning Resource Center). In case of rain, the location of the
event will be moved to the Jeff Bishop Student Center.
NOTE: A free, public celebration lecture titled “Sundials as Blending of
Art and Science” will be held on Monday, April 28, 2014, at 12:15 p.m. in
the Martha and Solon Dixon Center for the Performing Arts in Andalusia.
Making the presentation is LBWCC sundial creator Bill Gottesman, whose
interest in sundials comes from a love of science, mathematics, and
craftsmanship. His inspiration for the Renaissance sundial came from the
sun-beam scene in the 1981 movie “Raider’s of the Lost Ark.” He is an
active member of the North American Sundial Society and has been making
sundials as a business-hobby since 1999 under the name Precision Sundials
LLC.
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Fwd: NASS conference

[Fred Sawyer]

The 20th annual conference of The North American Sundial Society will be
held August 21-24, 2014 in Indianapolis IN.

Details will appear in the next issue of the Compendium and will be posted
on the NASS website as soon as they are completely final.

Fred Sawyer
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

News article

[Fred Sawyer]

Congratulations to John Carmichael on being featured in an article in
Inside Tucson Business.

http://www.insidetucsonbusiness.com/news/profiles/ancient-time-form-in-stone-is-carmichael-s-specialty/article_43fab1b6-216c-11e3-88ba-001a4bcf887a.html?mode=jqm

Fred Sawyer
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: sundial spotting

[Fred Sawyer]

Karin,

See a photo of the dial at

http://michel.lalos.free.fr/cadrans_solaires/autres_depts/orne/pays_d_alencon/cs_pays_d_alencon.html


Fred Sawyer


On Sunday, June 9, 2013, Karin ten Kleij-Meij karin...@yahoo.com wrote:

 Dear sundial people,
 Does the cadran solaire on this piece of art look familiar to you? :-)
 http://en.artscad.com/A.nsf/OPRA/SRVV-6D4TP2
 Best regards and wishing you a sunny day,
 Karin.
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Woody's ceiling sundial

[Fred Sawyer]

A local newspaper article on Woody Sullivan's ceiling sundial!

http://seattletimes.com/html/localnews/2020985468_sundialxml.html

Fred Sawyer
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Willy's note

[Fred Sawyer]

I have been fascinated to follow the discussion generated by Willy's note.
 But I have also been a bit worried.

Last November I developed a design for a new type of Sundial, based on a
theorem I had proved by both analytic and geometric means.  The theorem is
not the same as the one which has been under discussion here, but it is
clear to me that a proof of one could easily be modified to give a proof of
the other.

I have prepared a talk to present this theorem and Sundial at the NASS
conference in August - hopeful that it will not be pre-empted by the
coincidence of this discussion!

Registration details for the conference will be available in an upcoming
issue of The Compendium.  Please consider joining us in Cambridge MA, where
we will also view the large collection of sundials at Harvard University
and hear many other fascinating talks on an agenda that is already almost
full.  (If you will be attending and would like to give a talk, I need to
know right away!)

Fred Sawyer
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

NASS Conference

[Fred Sawyer]

I'm happy to say that the dates and hotel for the NASS conference have
now been set!

We will be meeting Aug. 22-25, 2013 in Boston/Cambridge, Massachusetts
at the Courtyard by Marriott.  Full details are not yet available,
since I am still finalizing the contract with the hotel (so please
don't try to make a reservation yet!) - but the dates and location are
definite.

In a slight departure from our usual agenda, our 'tour day' on Aug. 23
will omit the bus ride this year and will focus on two exhibits at
Harvard - the primary one being the Time exhibit that Sara Schechner
has mentioned on the Sundial List.  Harvard has the largest collection
of sundials in North America, and many of them will be on view as part
of the exhibit.  Sara, who is the curator of the collection, has also
indicated that we may be able to schedule some special viewings and
discussion of dials that are not in the exhibit.  Part of the exhibit
will include walking directions to a few other dials on the Harvard
campus - and to other Harvard museums with items of interest.  We are
also looking into the possibility of a visit to the Harvard
Observatory.

Details will be available on our website and in The Compendium when
they become available.  Plan to join us!

Fred Sawyer
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: IMAGES APLENTY

[Fred Sawyer]

Tony,

There is a large version of that Manship gnomon (one of my favorites) at
Brookgreen Gardens in South Carolina.  To see images of it, go to:

http://commons.wikimedia.org/wiki/File:Sundial_at_Brookgreen_Gardens.jpg

http://www.youtube.com/watch?v=U3XDJ4MH86s

http://swordsandswimmers.blogspot.com/2010/07/brookgreen-gardens.html

Fred






On Tue, Aug 28, 2012 at 1:39 PM, Tony Moss tonylindi...@talktalk.netwrote:

  The following answered one ofmy question viz. 'What was the full size
 dial made of?


 http://www.1939nyworldsfair.com/worlds_fair/wf_tour/statues/fates_of_man.htm  
  -

 ...which turns out to be plaster and explains the white colour.
 Somehow I doubt if the huge full-size version could have survived anywhere
 but the small bronze? model on a marble? base must be preserved somewhere.

 Any ideas?

 Tony M.

 P.S.  Many of the images my name spawns in Google Images seem to come from
 websites and PowerPoint presentations. 'Big Brother' seems to be watching.


  -Original Message-
 From: David Bell db...@thebells.net
 To: 'Roger Bailey' rtbai...@telus.net; 'Tony Moss' 
 tonylindi...@talktalk.net; 'Frank King' frank.k...@cl.cam.ac.uk
 CC: sundial@uni-koeln.de
 Sent: Tue, 28 Aug 2012 6:43
 Subject: RE: IMAGES APLENTY

  That might not be *the* reason, but I am certain that Google search on your
 computer does know you. Pros and cons...

 -Original Message-
 From: sundial [mailto:sundial-boun...@uni-koeln.de 
 sundial-boun...@uni-koeln.de?] On Behalf Of Roger
 Bailey
 Sent: Monday, August 27, 2012 8:52 PM
 To: Tony Moss; Frank King
 Cc: sundial@uni-koeln.de
 Subject: Re: IMAGES APLENTY

 Yes, Google Images offers many hits, mostly irrelevant. Frank King BSS
 Cambridge brings up only one image. Ditto Frank King sundials. Roger Bailey
 sundials brings up 10 legitimate hits on my computer, the first ten of many
 irrelevant hits. Is this because Google searching on my computer knows me?

 Regards, Roger Bailey

 --
 From: Frank King frank.k...@cl.cam.ac.uk
 Sent: Monday, August 27, 2012 10:02 AM
 To: Tony Moss tonylindi...@talktalk.net
 Cc: sundial@uni-koeln.de
 Subject: Re: IMAGES APLENTY

  Dear Tony,
 
  Google Images indeed represents a splendid
  resource and you can find lots of good pics
  of sundials and, if you wish, pictures of
  noted celebrities too.
 
  Try entering Tony Moss and you will see
  that you have more impersonators than Elvis!
  Still, the real thing is there around image
  Number 20 and again at around Number 70.
 
  Just keep going and you will come to the
  sundials too!  You will find pieces about
  you and your dials in Polish and French,
  but you know all that already!  I really
  like the WizardWand sun-substitute.
 
  Gee, what it is to have such CyberFame!
 
  All the best
 
  Frank
 
  ---
  https://lists.uni-koeln.de/mailman/listinfo/sundial
 
 ---https://lists.uni-koeln.de/mailman/listinfo/sundial


 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial



---
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Re: IMAGES APLENTY

[Fred Sawyer]

Tony,

The world's fair version was 50ft high.  The Brookgreen Gardens version is
bronze and stands 10ft. high.

Fred


On Tue, Aug 28, 2012 at 3:22 PM, Fred Sawyer fwsaw...@gmail.com wrote:

 Tony,

 There is a large version of that Manship gnomon (one of my favorites) at
 Brookgreen Gardens in South Carolina.  To see images of it, go to:

 http://commons.wikimedia.org/wiki/File:Sundial_at_Brookgreen_Gardens.jpg

 http://www.youtube.com/watch?v=U3XDJ4MH86s

 http://swordsandswimmers.blogspot.com/2010/07/brookgreen-gardens.html

 Fred






 On Tue, Aug 28, 2012 at 1:39 PM, Tony Moss tonylindi...@talktalk.netwrote:

  The following answered one ofmy question viz. 'What was the full size
 dial made of?


 http://www.1939nyworldsfair.com/worlds_fair/wf_tour/statues/fates_of_man.htm 
   -

 ...which turns out to be plaster and explains the white colour.
 Somehow I doubt if the huge full-size version could have survived
 anywhere but the small bronze? model on a marble? base must be preserved
 somewhere.

 Any ideas?

 Tony M.

 P.S.  Many of the images my name spawns in Google Images seem to come
 from websites and PowerPoint presentations. 'Big Brother' seems to be
 watching.


  -Original Message-
 From: David Bell db...@thebells.net
 To: 'Roger Bailey' rtbai...@telus.net; 'Tony Moss' 
 tonylindi...@talktalk.net; 'Frank King' frank.k...@cl.cam.ac.uk
 CC: sundial@uni-koeln.de
 Sent: Tue, 28 Aug 2012 6:43
 Subject: RE: IMAGES APLENTY

  That might not be *the* reason, but I am certain that Google search on your
 computer does know you. Pros and cons...

 -Original Message-
 From: sundial [mailto:sundial-boun...@uni-koeln.de 
 sundial-boun...@uni-koeln.de?] On Behalf Of Roger
 Bailey
 Sent: Monday, August 27, 2012 8:52 PM
 To: Tony Moss; Frank King
 Cc: sundial@uni-koeln.de
 Subject: Re: IMAGES APLENTY

 Yes, Google Images offers many hits, mostly irrelevant. Frank King BSS
 Cambridge brings up only one image. Ditto Frank King sundials. Roger Bailey
 sundials brings up 10 legitimate hits on my computer, the first ten of many
 irrelevant hits. Is this because Google searching on my computer knows me?

 Regards, Roger Bailey

 --
 From: Frank King frank.k...@cl.cam.ac.uk
 Sent: Monday, August 27, 2012 10:02 AM
 To: Tony Moss tonylindi...@talktalk.net
 Cc: sundial@uni-koeln.de
 Subject: Re: IMAGES APLENTY

  Dear Tony,
 
  Google Images indeed represents a splendid
  resource and you can find lots of good pics
  of sundials and, if you wish, pictures of
  noted celebrities too.
 
  Try entering Tony Moss and you will see
  that you have more impersonators than Elvis!
  Still, the real thing is there around image
  Number 20 and again at around Number 70.
 
  Just keep going and you will come to the
  sundials too!  You will find pieces about
  you and your dials in Polish and French,
  but you know all that already!  I really
  like the WizardWand sun-substitute.
 
  Gee, what it is to have such CyberFame!
 
  All the best
 
  Frank
 
  ---
  https://lists.uni-koeln.de/mailman/listinfo/sundial
 
 ---https://lists.uni-koeln.de/mailman/listinfo/sundial


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Re: IMAGES APLENTY

[Fred Sawyer]

Jack,

It is in the Registry:
http://sundials.org/index.php/component/sundials/onedial/283

Unfortunately, there's no photo and little description.  Any member who can
get to Brookgreen Gardens could help.  The photo in the wikimedia entry
could probably be used in the registry - it's available under a GNU Free
Documentation License.

Fred


On Tue, Aug 28, 2012 at 9:34 PM, Jack Aubert j...@chezaubert.net wrote:

  Not in the NASS registry!  Does anybody live in South Carolina?

 ** **

 *From:* sundial [mailto:sundial-boun...@uni-koeln.de] *On Behalf Of *Fred
 Sawyer
 *Sent:* Tuesday, August 28, 2012 3:23 PM
 *To:* Tony Moss
 *Cc:* Sundial List
 *Subject:* Re: IMAGES APLENTY

 ** **

 Tony,

 There is a large version of that Manship gnomon (one of my favorites) at
 Brookgreen Gardens in South Carolina.  To see images of it, go to:

 http://commons.wikimedia.org/wiki/File:Sundial_at_Brookgreen_Gardens.jpg

 http://www.youtube.com/watch?v=U3XDJ4MH86s

 http://swordsandswimmers.blogspot.com/2010/07/brookgreen-gardens.html

 Fred





 

 On Tue, Aug 28, 2012 at 1:39 PM, Tony Moss tonylindi...@talktalk.net
 wrote:

 The following answered one ofmy question viz. 'What was the full size dial
 made of?


 http://www.1939nyworldsfair.com/worlds_fair/wf_tour/statues/fates_of_man.htm  
  -

 ...which turns out to be plaster and explains the white colour.
 Somehow I doubt if the huge full-size version could have survived anywhere
 but the small bronze? model on a marble? base must be preserved somewhere.

 Any ideas?

 Tony M.

 P.S.  Many of the images my name spawns in Google Images seem to come from
 websites and PowerPoint presentations. 'Big Brother' seems to be watching.
 

 ** **

 ** **

 -Original Message-
 From: David Bell db...@thebells.net
 To: 'Roger Bailey' rtbai...@telus.net; 'Tony Moss' 
 tonylindi...@talktalk.net; 'Frank King' frank.k...@cl.cam.ac.uk
 CC: sundial@uni-koeln.de
 Sent: Tue, 28 Aug 2012 6:43
 Subject: RE: IMAGES APLENTY 

 That might not be *the* reason, but I am certain that Google search on 
 your

 computer does know you. Pros and cons...

 ** **

 -Original Message-

 From: sundial [mailto:sundial-boun...@uni-koeln.de 
 sundial-boun...@uni-koeln.de?] On Behalf Of Roger

 Bailey

 Sent: Monday, August 27, 2012 8:52 PM

 To: Tony Moss; Frank King

 Cc: sundial@uni-koeln.de

 Subject: Re: IMAGES APLENTY 

 ** **

 Yes, Google Images offers many hits, mostly irrelevant. Frank King BSS 

 Cambridge brings up only one image. Ditto Frank King sundials. Roger Bailey 
 

 sundials brings up 10 legitimate hits on my computer, the first ten of many 
 

 irrelevant hits. Is this because Google searching on my computer knows me?

 ** **

 Regards, Roger Bailey

 ** **

 --

 From: Frank King frank.k...@cl.cam.ac.uk

 Sent: Monday, August 27, 2012 10:02 AM

 To: Tony Moss tonylindi...@talktalk.net

 Cc: sundial@uni-koeln.de

 Subject: Re: IMAGES APLENTY

 ** **

  Dear Tony,

 ** **

  Google Images indeed represents a splendid

  resource and you can find lots of good pics

  of sundials and, if you wish, pictures of

  noted celebrities too.

 ** **

  Try entering Tony Moss and you will see

  that you have more impersonators than Elvis!

  Still, the real thing is there around image

  Number 20 and again at around Number 70.

 ** **

  Just keep going and you will come to the

  sundials too!  You will find pieces about

  you and your dials in Polish and French,

  but you know all that already!  I really

  like the WizardWand sun-substitute.

 ** **

  Gee, what it is to have such CyberFame!

 ** **

  All the best

 ** **

  Frank

 ** **

  ---

  https://lists.uni-koeln.de/mailman/listinfo/sundial

  

 ---

 https://lists.uni-koeln.de/mailman/listinfo/sundial

 ** **

 ** **


 ---
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 This message has been scanned for viruses and
 dangerous content by *MailScanner* http://www.mailscanner.info/, and is
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Re: Sundial found in Jamestown excavation

[Fred Sawyer]

Thad,

Thanks for pointing the problem out.  Evidently I inadvertently repeated
the URL instead of giving it only once.  This should work:

http://popular-archaeology.com/issue/june-2012/article/archaeologists-unearth-rare-17th-century-find-at-jamestown-excavations

Fred



On Wed, Jun 27, 2012 at 1:13 PM, Thaddeus Weakley thadweak...@yahoo.comwrote:

 I get an error when clicking on the link saying the page does not exist.

   *From:* Fred Sawyer fwsaw...@gmail.com
 *To:* Sundial List sundial@uni-koeln.de
 *Cc:* Bob Kellogg rkell...@comcast.net
 *Sent:* Wednesday, June 27, 2012 1:07:05 PM
 *Subject:* Sundial found in Jamestown excavation

 An exciting find in the Jamestown excavation - a 17th century diptych dial.

 See the article at:


 http://popular-archaeology.com/issue/june-2012/article/archaeologists-unearth-rare-17th-century-find-at-jamestown-excavationshttp://popular-archaeology.com/issue/june-2012/article/archaeologists-unearth-rare-17th-century-find-at-jamestown-excavations

 Be sure to view the video that shows the actual uncovering of the dial and
 the reverse engineering that determined the latitude for which it was
 made.  Note that the dialing scale the archeologist is using is a NASS
 scale I provided to members many years ago at the first NASS conference.
 (BTW if you haven't yet sent in your registration for this year's
 conference in Asheville NC, please do it soon!)  I believe the instructions
 he was using came from the Compendium article by Steve Woodbury.

 Fred Sawyer




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Sundial found in Jamestown excavation

[Fred Sawyer]

Bill,

I wasn't aware that the scale would play any role in the video - they did
not contact us at all.  But the scale he used was most definitely one Ron
Anthony and I made (my supply is down to only about 2-3 - the rest have
been distributed).  How he obtained the scale is not known at this point -
but I was glad to see him using it.

Fred


On Wed, Jun 27, 2012 at 7:03 PM, Bill Gottesman
billgottes...@comcast.netwrote:

  Fred's rediscovered Serle's dialing scale plays an important role in this
 video.  Fred, did the archeologists contact NASS for advice, and did the
 scale come from you?  The person demonstrating the scale could have been a
 bit more careful to make sure the drawn dial lines all intersected at the
 origin of the string-hole, but otherwise, the scales did the trick!

 -Bill


---
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Re: Shadow Clock Kit

[Fred Sawyer]

Bill

You need to read The Compendium more closely!  This kit was mentioned on
p.40 in last September's issue.

Fred


On Wed, Jun 20, 2012 at 5:02 PM, Bill Gottesman
billgottes...@comcast.netwrote:

 Hello Sundials Listers,

 This is not a sundial, but a kit for a clock that is kinda like a sundial
 - it tells time with shadows.  How did we miss this?

 http://evilmadscience.com/productsmenu/tinykitlist/156

 I ordered mine today.

 -Bill

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Re: BSS website

[Fred Sawyer]

Roger,

Spherical trig gives several ways to solve this.  Over the years, I've
given 3 different techniques in various articles in The Compendium.

Probably the most traditional approach is to use what one of the formulas
known as as Napier's analogies.  Complicated but no need for iterations.

First find angle B:  sin B = sin Az cos Lat / cos Dec

Then:  tan .5(90 - Alt) = tan .5(Lat - Dec) cos .5(B - Az) / cos .5(B + Az)

Fred


On Thu, Apr 26, 2012 at 12:55 PM, Granny Arby arby10...@yahoo.ca wrote:

I am having difficulty accessing the BSS website
 http://www.sundialsoc.org.uk/ Is it my wifi connection in a hotel in
 Mallorca or some other problem. Everry other website I tried connected
 easily but not any of the ways I tried to connect to the BSS. I am
 interested in a formula in the glossery, one that allows me to calculate
 altitude given latitude declination and azimuth. This is to look at
 solstice alignments of the rose windows in the cathedral in Palma, oriented
 at about 124 degrees.

 Regards, Roger Bailey
 aka arby101ca


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Frank King on radio (online)

[Fred Sawyer]

The March 28 edition of the Chris Evans Breakfast Show (from BBC Radio 2)
can be heard until April 4 online at:

http://www.bbc.co.uk/iplayer/episode/b01dpttc/The_Chris_Evans_Breakfast_Show_The_Clock_Doc_teaches_us_about_sundials/

The show includes an interview with The Clock Doc Frank King.   You can
skip through the program, if you like, by moving the cursor until you are
at the 2hour 10minute mark.  Frank is on for a little more than 5 minutes.

The program description:

We learn all about sundials from the Doc of Clever Clocks, Frank King, who
conducts the first radio interview without being asked any questions.

Nicely done Frank!

Fred Sawyer
---
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Cardioid sundial

[Fred Sawyer]

Richard,

The Wikipedia entry is evidently describing the dial I introduced in a
BSS article in July 1991 as The Equant Dial

A version is currently made by Bill Gottesman - see
http://www.precisionsundials.com/equant%20dial.htm

Fred Sawyer

On Wed, Nov 16, 2011 at 4:31 PM, Richard Mallett
100114@compuserve.com wrote:
 The Wikipedia entry on Sundials describes a sundial that uses a cardioid
 curve to convert solar time to clock time.  Are there any known examples of
 this ?

 --
 --
 Richard Mallett
 Eaton Bray, Dunstable
 South Beds. UK


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Saturn Sundial

[Fred Sawyer]

Shadows of the rings of Saturn as a sundial:
http://apod.nasa.gov/apod/ap111012.html

Fred Sawyer
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Re: Where it wil be equinox, at noon

[Fred Sawyer]

Axel

Just a word of caution:  The one thing that Dialist's Companion does NOT do
well at is determining the time of solstices and equinoxes.  Please do not
use it as a standard for these times.

Fred Sawyer


2011/9/22 axel törnvall gonzalez atg...@hotmail.com

  This is my Subject;

 Finding the position, Longitud, where, the sprig equinox, will ocurr at
 noon, I found some diference between the results of The Dialist´s
 Companion, and Sun v.5.6 Of R.Cernic, both programs I work for some time.

  In Longitud  42°12,80 E at 13:03:42  PM it will be Noon, for my studies

 Then I placed both programs in Latitud and longitud 0°, and in Sun v5.6 of
 R.Cernic I got UT 09:03:59 AM and in The Dialist´s Companion, I found the
 nearest cero declination at 08:44:47AM the altitude measure have a
 difference of almost 5°, I Know The Dialist Companion I Use vers 1.1.b is
 old.

 Sorry my english, it´s not my first language

 Best regards for all of you

 Axel

 32°39'59S
 70°42'41W


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Re: Matin Lotto

[Fred Sawyer]

Tony,

His are the times.

Fred


On Sat, Aug 13, 2011 at 10:18 AM, Tony Moss t...@lindisun.demon.co.uk wrote:
 Hi all,
         To limp back on topic, I have been asked to include the motto
 'IPSIUS SUNT TEMPORA' in the design a dial to be carved in stone - by
 someone else.

 The originator is a real live Franciscan hermit who lives on a hill in the
 wilds of Northumberland so a direct query to him would involve the Royal
 Mail and probably Pony Express and I need to know quickly. Can someone
 satisfy my curiosity with a translation please?

 Tony Moss

 P.S.  For the curious the Hermitage can be found at

 http://www.geograph.org.uk/photo/2043589
 ---
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Re: Shadow Forensics

[Fred Sawyer]

See the Obsession episode from season 2 of NUMB3RS.  I consulted with the
producers on that episode to develop a way to use shadows in photographs to
determine the location, given the date and time of the photo.

Fred Sawyer


On Fri, Jul 8, 2011 at 4:40 PM, Brent bren...@verizon.net wrote:

 Hello again;

 I was looking at an aerial photograph of a piece of property with a
 surveyor.

 We started to discuss when the photo was taken.
 We could tell by the brown vegetation that it was probably late summer here
 in So. California.

 I also noticed a shadow cast from a telephone pole.

 I think by measuring the height of the pole, the length and angle of the
 shadow I might be able to figure out what day of the year it was taken and
 the time. I would have to know the latitude and longitude to do this. I knew
 the top of the photo was north.

 I started to think if I only knew the day and time the photo was taken I
 might be able to determine the latitude and longitude.

 So I wonder if police ever use shadows in their investigations?

 For example, a video of a terrorist holding a hostage. The hostage holding
 a newspaper showing the date. They are outside with visible shadows being
 cast. Could we figure out where they are holding the hostage?

 How about if the police say I ran a Redlight at 3pm on a certain date and
 they have a photograph to prove it.
 Maybe if they were wrong, I could prove my innocence by the shadows cast by
 my car.

 So guess the big question is, does anyone make practical use of shadows?

 thanks again;
 brent

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A white Jantar Mantar

[Fred Sawyer]

From
http://www.mid-day.com/news/2011/may/230511-red-fort-was-originally-white.htm

The Archaelogical Survey of India (ASI) ... discovered  that Delhi's
celebrated Jantar Mantar building, an early 18th Century series of giant
'red stone' sundials and astronomical instruments built by the Maharaja of
Jaipur, was also once white. They are now making plans to restore this major
tourist attraction to its original colour.



Fred Sawyer
---
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9/11 'sundial' memorial

[Fred Sawyer]

Maryland is planning a 9/11 memorial using the shadow of a building to
indicate the times of the various events of the tragedy.

See http://www.maryland911memorial.org/about-the-memorial/memorial-design

Fred Sawyer
---
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Re: Ben Franklin's Sundial Coin

[Fred Sawyer]

John,

Alice Morse Earle addresses the question of Franklin's inspiration for
the motto this way:

It will be recalled that Franklin had known much of the postal
service of Great Britain before he
became postmaster-general for the American colonies under the crown.
And he had lived long in London,
where on the general post-office was a sun-dial with the motto, BE
ABOUT YOUR BUSINESS. I have never
doubted that it was entirely Franklin's taste which supplied to our
new nation the sun-dial design and
the motto, MIND YOUR BUSINESS. In this form, and the one on the London
post-office, and in the
form, BEGONE ABOUT YOUR BUSINESS, it was found on several English sun-dials.

Fred

On Wed, Apr 13, 2011 at 3:07 AM, JOHN DAVIS
john.davi...@btopenworld.com wrote:

 Hi John C et al,

 Here in England, 'Mind your business' (or 'Go about your business') is a not 
 uncommon sundial motto - there is one on a vertical church dial from the 
 1700s not far from where I live. I wonder if Franklin saw one of them?

 Regards,

 John D
 --

 Dr J Davis
 Flowton Dials

 --- On Tue, 12/4/11, John Carmichael jlcarmich...@comcast.net wrote:

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Gnomon watch proposal

[Fred Sawyer]

An interesting idea:

http://technabob.com/blog/2011/04/07/gnomon-sundial-watch-concept/

Fred Sawyer
---
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Sun City sundial in jeopardy

[Fred Sawyer]

Sun City Wants to Remove Landmark Sun Dial
http://www.myfoxphoenix.com/dpp/news/local/nw_valley/landmark-sun-dial-2-21-2011

Fred Sawyer
---
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An Interesting Juxtaposition

[Fred Sawyer]

An interesting photo:  http://www.twanight.org/newTWAN/photos.asp?ID=3002926

Fred Sawyer
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Windows 7 themes?

[Fred Sawyer]

Windows 7 has a facility to easily create themes - a collection of several
wallpaper photos that cycle periodically on the desktop.  It would be great
if anyone who has created a theme displaying some beautiful sundials made it
available for others on the list.

Fred Sawyer
---
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return of sundial?

[Fred Sawyer]

See
http://www.congress.org/congressorg/bio/userletter/?letter_id=6195591101content_dir=politicsol
for a plea to President Obama relating to a sundial.

Fred Sawyer
---
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Kathleen Wright

[Fred Sawyer]

Frank,

See http://tinyurl.com/2fpvfah for a source for Higgins' article The
Classification of Sundials - done while she was Assistant Curator at the
Museum of the History of Science, Oxford.  I believe it was based on her
thesis - a copy of which I have somewhere in my files although I can't
locate it at the moment.  The article was published in 1953 - I'm not aware
of her ever publishing anything else on the subject.

Fred Sawyer





On Sat, Dec 4, 2010 at 3:53 PM, Frank King frank.k...@cl.cam.ac.uk wrote:

 Dear All,

 A biographer has asked me whether I can supply
 any details of someone he is writing about who
 seems to have had some interest in sundials.

 The bare facts are:

  Name:  Kathleen Wright (nee Higgins)

  Born:  Not known but about 1925

  Died:  1 January 1999

  Oxford University: 1944 to 1947

 She wrote some reports on a couple of churches
 where she particularly drew attention to their
 scratch dials: Coln St Aldwyns and Bibury.

 So far, the biographer has identified only one
 person who was acquainted with Kathleen and he
 said, unprompted, that she had a research interest
 in old sundials.

 I am pretty dismal at remembering names and do
 not know whether this person is well known to
 diallists (with better memories than mine) or
 is quite unknown.

 It should be easy to find out the date of birth
 but I haven't managed even that :-(

 It should be easy to find out her Oxford College
 but this is proving challenging too.  There weren't
 many women's colleges in those days so I may have
 to search each one in turn.

 If anyone has any leads please let me know.

 Frank King
 Cambridge, UK

 ---
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Kathleen Wright

[Fred Sawyer]

Frank,

According to:
http://rfrost.people.si.umich.edu/courses/MatCult/content/bladerunner.pdf
she held the post at the museum from 1948-1953.

Fred Sawyer




Frank,

See http://tinyurl.com/2fpvfah for a source for Higgins' article The
Classification of Sundials - done while she was Assistant Curator at the
Museum of the History of Science, Oxford.  I believe it was based on her
thesis - a copy of which I have somewhere in my files although I can't
locate it at the moment.  The article was published in 1953 - I'm not aware
of her ever publishing anything else on the subject.

Fred Sawyer





On Sat, Dec 4, 2010 at 3:53 PM, Frank King frank.k...@cl.cam.ac.uk wrote:

 Dear All,

 A biographer has asked me whether I can supply
 any details of someone he is writing about who
 seems to have had some interest in sundials.

 The bare facts are:

  Name:  Kathleen Wright (nee Higgins)

  Born:  Not known but about 1925

  Died:  1 January 1999

  Oxford University: 1944 to 1947

 She wrote some reports on a couple of churches
 where she particularly drew attention to their
 scratch dials: Coln St Aldwyns and Bibury.

 So far, the biographer has identified only one
 person who was acquainted with Kathleen and he
 said, unprompted, that she had a research interest
 in old sundials.

 I am pretty dismal at remembering names and do
 not know whether this person is well known to
 diallists (with better memories than mine) or
 is quite unknown.

 It should be easy to find out the date of birth
 but I haven't managed even that :-(

 It should be easy to find out her Oxford College
 but this is proving challenging too.  There weren't
 many women's colleges in those days so I may have
 to search each one in turn.

 If anyone has any leads please let me know.

 Frank King
 Cambridge, UK

 ---
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New Sundial Browser

[Fred Sawyer]

There is a new free firefox-based Internet browser available.  Its name is
Sundial - and it has a sundial logo.  Why this name was chosen is not clear.

Go to:  http://sundialbrowser.com/en/

Fred Sawyer
---
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Re: Declination and Inclination

[Fred Sawyer]

Frank,


 The key paragraph in your note is:


 I use this order because both rotations are
 about axes IN THE PLANE being used.  This
 keeps rotation matrices simple and so on.

 There is no real need to do one before the other - unless you are concerned
 about making the matrix manipulations simple.  Historically, this was not an
 issue - and in particular it was not a worry that rotations are not
 commutative.  The rotations can be defined so that it doesn't matter which
 order they are done in - and that is perhaps why it's a question that did
 not come up (I don't believe) in historical texts.  The inclination is a
 rotation about a horizontal line in the dial plane and the declination is a
 rotation about a vertical line (whether in the plane or not).  If you use
 these definitions, you can incline and then decline or you can decline and
 then incline - you'll get the same plane.

 In trying to treat the math as matrix manipulation, you'd like the rotation
 about the vertical line to be in the plane of the dial - so that's why you
 choose the order you do - but it's simply a matter of convenience.
 Inclination is the angle the line of greatest slope makes with the
 horizontal plane.  Declination is the angle the horizontal line in the dial
 plane makes with the horizontal meridian.  (There may be slight ambiguity if
 you begin with a horizontal plane - but this goes away if you draw
 east-west/north-south axes that will become the line of greatest slope and
 the always horizontal line).

 The history of inclination / declination is indeed messy.  Things got to be
 so weird that you even have someone like John Wells who labels a dial as
 horizontal that you and I would today call a vertical direct south dial.
 Even today people use inclination and reclination in different ways.  I tend
 to think of inclination as the angle above the horizontal, and reclination
 (and proclination) as the angle from a vertical plane.

 Fred Sawyer






 On Tue, Aug 31, 2010 at 2:37 AM, Frank King frank.k...@cl.cam.ac.ukwrote:

 Dear All,

 An intriguing question has been raised on the
 Italian Sundial list by Fabio Savian.  Slightly
 re-expressed he is asking...

  When specifying the orientation of a plane
  dial, is your order:

   A) Declination then Inclination

   B) Inclination then Declination   ?

 This is important because rotations are not
 commutative: R1.R2 does not equal R2.R1.

 My own answer is firmly (A) and (slightly
 simplified and avoiding using either word)
 I think as follows:

   1.  Start with a vertical plane facing
   due north (sic).

   2.  Rotate about a vertical axis until
   it has the correct azimuth.

   3.  Rotate about a horizontal axis until
   the tilt is right.

 I use this order because both rotations are
 about axes IN THE PLANE being used.  This
 keeps rotation matrices simple and so on.

 An alternative is:

   1.  Start with a vertical plane facing
   due north.

   2.  Rotate about a horizontal axis until
   the tilt is right.

   3.  Rotate about a vertical axis until
   the azimuth is right.

 This is fine but the second rotation is not
 about an axis in the plane being used.

 Here I quote a delightful observation by
 John Davis in the BSS Glossary referring
 to a definition of inclination:

   Beware: this convention is not followed
   by all authors.

 He could be referring to a host of other
 definitions :-)

 OK.  Which way do you all do things:

   Dec then Inc   or   Inc then Dec  ?

 There is no right answer but it would be
 interesting to hear who does what!

 Frank King
 Cambridge, U.K.

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Tad Dunne?

[Fred Sawyer]

Donald Christensen (Queensland, Australia) is trying to locate Tad Dunne,
who was once a subscriber to this List.  If anyone can help, please contact
Donald directly at:
dchristensen...@gmail.com

Fred Sawyer
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Youngstown sundial

[Fred Sawyer]

A new sundial in Youngstown OH:

http://www.business-journal.com/ysu-dedicates-sundial-in-memory-of-pirko-p17312-1.htm

Fred Sawyer
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NASS sundial tour

[Fred Sawyer]

A link to a newspaper article about the sundial tour at the NASS conference:

http://is.gd/enw0G

Fred Sawyer
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newspaper coverage of next week's NASS conference

[Fred Sawyer]

See http://is.gd/e7Kyq for a newspaper article about next week's NASS
conference.

Fred Sawyer
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NASS Conference in Burlington VT

[Fred Sawyer]

The annual NASS Conference will take place August 12-15 in Burlington
VT.  As usual, we will have a reception, a full day bus tour of area
sundials, and a day and a half of talks and exhibits.  If you are
considering joining us, please register right away - the deadline is
fast approaching.  Go to http://sundials.org/conferences.php for more
info and instructions on how to register.

Fred Sawyer
---
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Sundial on Monk

[Fred Sawyer]

The series finale (after many years on television) of Monk last night
featured a sundial.  Monk found an essential clue to proving who had
killed his wife by taking note of a sundial that had been placed in
permanent shade under a very large tree.  He concluded that no one
would actually do that if they intended the dial for its proper
purpose - so he reasoned that it marked the site where the evildoer
had buried evidence.

If he only knew the truth of the matter...  people do that all time.

Fred


On Sat, Dec 5, 2009 at 10:00 AM, Tony Moss t...@lindisun.demon.co.uk wrote:
 This caught my attention amongst regular news items.

 Tony Moss.

 **

 BBC CEEFAX North East  Cumbria News  Saturday 5th December.

 A physiotherapist has been given a 12 month caution for encouraging a
 patient to fire an air pistol at a sundial.

 The Health Professional Council panel also heard that Stephen Sterling,
 of Sunderland, told the serious head injury patient to demolish a wall.

 Panel members said allowing a person who had suffered neurological
 damage in a road accident to fire a pistol amounted to misconduct

 Mr. Sterling admitted he now realized he had stepped over the mark.
 ---
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Re: Origin of the Analemma figure?

[Fred Sawyer]

Patrick

Not quite right. Foster had many firsts, but he didn't discuss the  
figure  8 Analemma.  What I said in my article that seems to be your  
source, was that Foster gave the first English treatment of the  
analemmatic sundial.


Fred


Sent from my iPod

On Nov 15, 2009, at 3:10 AM, patrick_pow...@compuserve.com wrote:


The BSS Glossary (courtesy of John Davis) says:

The word analemma has had several other meanings in the history of  
astronomy and dialling. In the first century BC, the Roman engineer  
Vitruvius used the word to refer to a graphical construction,  
equivalent to today's orthographic projection. In the second century  
AD Ptolemy used analemma to mean an instrument acting as a nomograph  
for defining the angles of a dial. The use of a modern analemma on a  
dial dates to around 1640, and the first treatment in English was by  
Samuel Foster in 1654.


Does this help?

Patrick

-Original Message-
From: Jack Aubert jaub...@cpcug.org
To: sundial@uni-koeln.de
Sent: Sat, Nov 14, 2009 11:18 pm
Subject: Origin of the Analemma figure?

I recently revised my notes for a sundial talk I was giving which  
included a section on the EOT, and  its connection with the  
traditional figure 8 analemma.   I wanted to explain its origin, or  
at least be able to answer the question if asked, but have not been  
able to find any believable references on how it emerged.   I assume  
that the source of the figure is simply a “connect the dots”  
picture of what the sun, or a gnomon pointer will trace it out over  
the course of the year projected onto a surface.   But I do not see  
how the dots can be generated without using an external non-solar so 
urce of time.
The Wikipedia article on the EOT has a confusing statement to the  
effect that Ptolomey was aware of the variation in the sun’s movemen 
t and even devoted a chapter to the subject, but then says that he d 
id not correctly account for the two sources of variation.  Is there 
 any evidence that the Greeks or Romans ware aware of, and used, the 
 analemma representation, perhaps generated by reference to a clepsy 
dra, or did it first appear when mechanical clocks became prevalent?

Jack
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Re: Origin of the Analemma figure?

[Fred Sawyer]

I forgot to point out - the 1640 reference is to Vaulezard's  
analemmatic dial - which did not include a modern figure 8 Analemma.


Fred

Sent from my iPod

On Nov 15, 2009, at 3:10 AM, patrick_pow...@compuserve.com wrote:


The BSS Glossary (courtesy of John Davis) says:

The word analemma has had several other meanings in the history of  
astronomy and dialling. In the first century BC, the Roman engineer  
Vitruvius used the word to refer to a graphical construction,  
equivalent to today's orthographic projection. In the second century  
AD Ptolemy used analemma to mean an instrument acting as a nomograph  
for defining the angles of a dial. The use of a modern analemma on a  
dial dates to around 1640, and the first treatment in English was by  
Samuel Foster in 1654.


Does this help?

Patrick

-Original Message-
From: Jack Aubert jaub...@cpcug.org
To: sundial@uni-koeln.de
Sent: Sat, Nov 14, 2009 11:18 pm
Subject: Origin of the Analemma figure?

I recently revised my notes for a sundial talk I was giving which  
included a section on the EOT, and  its connection with the  
traditional figure 8 analemma.   I wanted to explain its origin, or  
at least be able to answer the question if asked, but have not been  
able to find any believable references on how it emerged.   I assume  
that the source of the figure is simply a “connect the dots”  
picture of what the sun, or a gnomon pointer will trace it out over  
the course of the year projected onto a surface.   But I do not see  
how the dots can be generated without using an external non-solar so 
urce of time.
The Wikipedia article on the EOT has a confusing statement to the  
effect that Ptolomey was aware of the variation in the sun’s movemen 
t and even devoted a chapter to the subject, but then says that he d 
id not correctly account for the two sources of variation.  Is there 
 any evidence that the Greeks or Romans ware aware of, and used, the 
 analemma representation, perhaps generated by reference to a clepsy 
dra, or did it first appear when mechanical clocks became prevalent?

Jack
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Re: Analemma origins.

[Fred Sawyer]

Jack

Andrée Gotteland did a 25 page article on Grandjean de Fouchy and his  
'invention' of the meantime curve.  Horlogerie ancienne 1990


Fred


Sent from my iPod

On Nov 15, 2009, at 10:56 AM, jack j...@chezaubert.net wrote:


Fred,



I know that there were graphic representations of conic sections and  
other mathematical dating from antiquity, but I simply don’t know ho 
w people graphed arbitrary tabular values before Cartesian coordinat 
es, or even if they graphed them at all.  Maybe the “cartesian”  
system was actually in use before he lent his name to it.  I just do 
n’t know.




Assuming you were already using an  x  y system to plot tabular  
values, you could plot them out for 12 months, and sure, you might  
note that that the values  cycle through the same declinations and  
it might occur to you that you could fold the graph back to come up  
with a figure eight.  But it strikes me as unlikely that anybody  
would think to represent it that way spontaneously just working from  
tabular values.  It’s not that it is difficult, just that it does no 
t seem natural.




On the other hand, if you can take a photo of the sun throughout the  
year using a clock release, or if you use a mirror and mark marks on  
the ceiling, or if you mark a nodus shadow every day, the figure 8  
trace will leap out at you as a natural way to represent the EOT.




Jack







From: Fred Sawyer [mailto:fwsaw...@gmail.com]
Sent: Sunday, November 15, 2009 10:31 AM
To: j...@chezaubert.net
Subject: Re: Analemma origins.



Jack



Your question puzzles me.  I don't see anything strange or difficult  
about the Analemma that would make it difficult to discover once the  
equation of time is known.  Ptolemy gives a table of values.  Once  
we have the idea of graphing tabular values, we draw a graph - that  
yields the familiar wot graph.  From that you get the Analemma  
simply by realizing that your x values cycle through the same  
declinations twice - so it's possible to fold the graph in half,  
showing each 'new' x value only once.   That doesn't require any  
empirical tracing.


Sent from my iPod


On Nov 15, 2009, at 10:11 AM, Jack Aubert jaub...@cpcug.org wrote:

I think this was really a two part question.



The first question is the historical origins of the discrepancy  
between apparent and mean solar time.


I look forward to reading Kevin Karney’s discussion of Ptolemy’s  
treatment of this which should answer the first question.  But there 
 is a distinction between the equation of time itself and the use of 
 the figure 8 analemma to represent it.




John Carmichael rephrased the second question more explicitly:  “Cou 
ld the analemma have been discovered without the empirical methods u 
sing just astronomy and math…”




Fred Sawyer writes:  “The figure 8 is usually attributed to Grandjea 
n de Fouchy…”  Fred’s encyclopedic knowledge can be taken as  
authoritative with respect to the first appearance the figure.  But  
the coordinate system that generates the figure 8 plot is virtually  
unique and is not something that one would normally come up with to  
display any arbitrary time series, so I think it must have been disc 
overed empirically either by Grandjean de Fauchy himself or by other 
s who lived before him.  Grandjean de Fauchy lived from 1707 to 1788 
,  well into the clock era.




Could the figure have been “discovered” without a clock (I am  
counting a clepsydra as a clock) and are there any antecedents that  
predate the mechanical clock era?




Jack





From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni- 
koeln.de] On Behalf Of Fred Sawyer

Sent: Saturday, November 14, 2009 11:30 PM
To: Sundial List
Subject: Analemma origins.





Sent from my iPod


Begin forwarded message:

From: Fred Sawyer fwsaw...@gmail.com
Date: November 14, 2009 7:11:18 PM EST
To: John Carmichael jlcarmich...@comcast.net
Subject: Re: Analemma origins.

The next issue of the compendium will have an article by Kevin  
Karney showing Ptolemy's treatment of the equation of time - it does  
not require a clock.


The figure 8 is usually attributed to Grandjean de Fouchy - perhaps  
incorrectly - but this is only a graphical way to display sething  
that had been known but not completely understood for centuries.


Fred

Sent from my iPod

On Nov 14, 2009, at 6:58 PM, John Carmichael jlcarmich...@comcast.net 
 wrote:





Hi Tony et all





Yes, I think you might be on the right track. The discoveor of the  
analemma


would need to have some sort of a clock that tells Mean Time (constant

time).  Sand clocks, candle clocks and water clocks all keep Mean  
Time don't


they?  Of these ancient clocks, I'm guessing that the most precise  
would be


the water clocks.



If a sundial nodus shadow was plotted onto a sundial face using a  
particular


time each day as told by a good water clock, then could'nt an  
ancient dialst


have been able to draw the analemma on a sundial face using

Re: 2010 Convention

[Fred Sawyer]

 Hi John and All,

 The NASS conference will be Aug. 12-15, 2010 in Burlington VT.

 Plan to be there!  You'll find the group very welcoming.

 Fred Sawyer


 Sent from my iPod

 On Nov 15, 2009, at 5:10 PM, John Mulholland jfmulhollan...@yahoo.com
 wrote:

 Shadow watchers,

 I have been tracking all of you with much joy, anticipation and education.
 I have made a few posts but I must kneel before such greatness.

 What is so truly admirable about this site is the humbleness with which
 information is shared. I cannot wait to meet you in person. Has the
 convention date and location for 2010 been established?

 John Mulholland
 NEK Vermont




 ---
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Analemma origins.

[Fred Sawyer]

Sent from my iPod

Begin forwarded message:


From: Fred Sawyer fwsaw...@gmail.com
Date: November 14, 2009 7:11:18 PM EST
To: John Carmichael jlcarmich...@comcast.net
Subject: Re: Analemma origins.



The next issue of the compendium will have an article by Kevin  
Karney showing Ptolemy's treatment of the equation of time - it does  
not require a clock.


The figure 8 is usually attributed to Grandjean de Fouchy - perhaps  
incorrectly - but this is only a graphical way to display sething  
that had been known but not completely understood for centuries.


Fred

Sent from my iPod

On Nov 14, 2009, at 6:58 PM, John Carmichael jlcarmich...@comcast.net 
 wrote:



Hi Tony et all


Yes, I think you might be on the right track. The discoveor of the  
analemma
would need to have some sort of a clock that tells Mean Time  
(constant
time).  Sand clocks, candle clocks and water clocks all keep Mean  
Time don't
they?  Of these ancient clocks, I'm guessing that the most precise  
would be

the water clocks.

If a sundial nodus shadow was plotted onto a sundial face using a  
particular
time each day as told by a good water clock, then could'nt an  
ancient dialst
have been able to draw the analemma on a sundial face using the  
emperical
method?  The Egyptians had good water clocks.  Couldn't they have  
discovered

the analemma?

Could it be done today with a modern precise water clock?

Or could the analemma have been discovered using just astronomy and  
math

without the emperical method using a nodus, the sun and a clock?

John C.


-Original Message-
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni- 
koeln.de] On

Behalf Of Tony Moss
Sent: Saturday, November 14, 2009 4:33 PM
To: Sundial Mailing List
Subject: Analemma origins.

Jack Aubert wrote:


I recently revised my notes for a sundial talk I was giving which
included a section on the EOT, and its connection with the  
traditional
figure 8 analemma. I wanted to explain its origin, or at least be  
able

to answer the question if asked, but have not been able to find any
believable references on how it emerged. I assume that the source of
the figure is simply a connect the dots picture of what the sun,  
or

a gnomon pointer will trace it out over the course of the year
projected onto a surface. But I do not see how the dots can be
generated without using an external non-solar source of time.

The Wikipedia article on the EOT has a confusing statement to the
effect that Ptolomey was aware of the variation in the sun's  
movement

and even devoted a chapter to the subject, but then says that he did
not correctly account for the two sources of variation. Is there any
evidence that the Greeks or Romans ware aware of, and used, the
analemma representation, perhaps generated by reference to a
clepsydra, or did it first appear when mechanical clocks became
prevalent?

Jack

Did the analemma concept arrive with Huygens and his accurate  
mechanical
clocks? My guess is that he initially set his clocks by the sundial  
but

eventually came to realize that the clocks were 'accurate' and the
sundial was varyingly 'out-of-step'. I'd love to have any evidence
surrounding this notion.

Tony Moss
---
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Only A Matter Of Time

[Fred Sawyer]

 45 minute BBC Radio 7 play: *Only A Matter Of Time*.

When time was standardized in the 19th century, not everyone was convinced
by the idea.  In the 1840's, Wales is on the brink of the Industrial
Revolution but not yet ready to embrace the impact of time standardization
with the arrival of Brunel's railway from London.   An Englishman arrives
and comes across a local man. They exchange views on the pros and cons of
human progress.   All they need to do is adopt London time!

It will be playing Thursday, Sept. 10 at 6:15am Eastern Daylight Time -
repeating at 4:15pm EDT and 9:15pm EDT.  Obviously, if you're not in the
Eastern Time Zone, you need to make an adjustment to those times.
At those times it can be heard online at :
http://www.bbc.co.uk/programmes/b007qrqk.  Click on Listen Live.

Many of the BBC7 programs can be listened to at this site at any time for 7
days after their initial airing.  Whether or not this play will fall into
that category is unknown at the moment.

Fred Sawyer
---
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Fwd: DOSBox and Dialist's Companion

[Fred Sawyer]

The Dialist's Companion can also be set for any time - and will run from
that point on.  So it too can be used for short intervals if this route is
taken - the automatic update should be ok for a while - but problems with
the DOSBox timer will catch up with it.

Fred



On Sun, Jun 7, 2009 at 12:58 AM, James E. Morrison 
janus.astrol...@verizon.net wrote:


 Some time ago, not long after Vista made its presence known in several
 bizarre ways, I tested The Electric Astrolabe with DOSBox.  I noticed it was
 gradually losing time compared to the system clock, starting at just a few
 seconds but losing a little time continuously.  It just gets worse the
 longer you run it.  That is, it never catches up regardless of what you do
 with the timer.

 I corresponded with the developers about it.  The discussion gets all
 wrapped up in the technical differences between how native DOS handles the
 timer and how DOSBox does it.  The short answer to the outcome was that the
 developers are really more interested in running DOS based games, which rely
 heavily on elapsed times, and never really tried to make the time retreived
 from a DOS call match the system value and they had no plans to work in this
 area.  I just download and tested version 0.74, which says it has some timer
 changes, and I see no difference in the behaviour.

 It is not dreadful for my uses since I can set The Electric Astrolabe to
 any time I want, but it does lose the ability to have an accurate display
 that is updated automatically and the Now function to set the display to
 the current date and time is not correct.

 I am not aware of any solution on the horizon.

 Best regards,

 Jim

 James E. Morrison
 janus.astrol...@verizon.net
 Astrolabe web site at http://astrolabes.org


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Re: R: Dialists' Companion

[Fred Sawyer]

Hi Gian,

At the last NASS conference I pointed out to people that your Simulation
feature does give much of the same information as The Dialist's Companion.
Perhaps the biggest difference, if I recall correctly, is that you do not
give an instantaneous updating of the equation of time.

Fred


On Sun, Jun 7, 2009 at 5:13 AM, sun.di...@libero.it sun.di...@libero.itwrote:

 Dialist Companion has been my first reference when I started working with
 sundials.

 Now I currently use the Simulation feature of my Orologi Solari that gives
 similar information
 (although it was developed with a different purpose and so it differs
 slightly in its philosopphy
 from DC). I always run OS on 32 bit systems, never tried a 64 bit one,
 however it is developed for
 Windows so it should not suffer of the same problem.

 If useful, I think that it would not be difficult to extract the Simulation
 window from OS
 and let it run as a standalone application.

 Gian Casalegno

 Messaggio originale
 Da: t...@lindisun.demon.co.uk
 Data: 07/06/2009 10.36
 A: Sundial Mailing Listsundial@uni-koeln.de
 Ogg: Dialists#39; Companion
 
 I know nothing of PC systems, or indeed very much about the Dialists'
 Companion, but other software gets re-written to keep up with the
 times.  Would it be such a huge task to produce a current version?
 
 How I wish it was available for the Mac, but a new item would probably
 run OK on one of the PC emulators now in use.
 
 Tony Moss
 ---
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DOSBox and Dialist's Companion

[Fred Sawyer]

In the current issue of The Compendium, I pointed out that DOSBox portable
can be easily used to keep the Dialist's Companion running in Vista, both 32
and 64 bit versions.  However, Don Snyder has done some tests and points out
correctly that DOSBox seems to introduce a lag time in the value for the
current time.  I've tried it for comparison and I also get a lag time - but
significantly different from Don's.

As a result, I would have to say that DOSBox is, after all, NOT a good
alternative for keeping the Dialist's Companion running.

Fred Sawyer
---
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DOSBox and Dialist's Companion

[Fred Sawyer]

In the current issue of The Compendium, I pointed out that DOSBox portable
can be easily used to keep the Dialist's Companion running in Vista, both 32
and 64 bit versions.  However, Don Snyder has done some tests and points out
correctly that DOSBox seems to introduce a lag time in the value for the
current time.  I've tried it for comparison and I also get a lag time - but
significantly different from Don's.

As a result, I would have to say that DOSBox is, after all, NOT a good
alternative for keeping the Dialist's Companion running.

Fred Sawyer
---
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Interesting sundial in Japan

[Fred Sawyer]

Perhaps I'm missing something, but it seems to me that this dial is
getting more attention than it deserves.  It looks to me to be one of
those very expensive 'sculptures' made by an artist who really does
not understand how a dial works.  This dial is not made right - it
will not indicate the correct time - the relationship between the
plane of hour lines and the gnomon is all wrong.  The markings don't
appear to me to be braille-like.  They are simply 3 pips on the hour
and 2 pips every 10 minutes.  The fact that some of the pips aren't
visible is probably just a trick of lighting in this particular photo.

As I said - unless I've missed something here - this is a 'dial' I
would pass by without paying it any heed.

Fred


On Tue, Apr 28, 2009 at 12:29 PM, J. Tallman
jtall...@artisanindustrials.com wrote:
 Hello All,

 Here is a dial in Japan that I thought some of you may find interesting:

 http://commons.wikimedia.org/wiki/File:Sundial_bunkanomori_tokushima.jpg

 I have seen it a couple times in the past month while casually browsing for
 sundial pictures, but I have never been able to find a good description for
 it. Does anyone know about this dial? I would be interested in what some of
 you think is really going on here, since this is a pretty unique
 configuration.


 Best,

 Jim Tallman
 www.artisanindustrials.com
 jtall...@artisanindustrials.com

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Are there any accurate mass-produced or reproduction horizontalsundials?

[Fred Sawyer]

Thad,

And if a person wants to correct for longitude, they can tilt their
dial up a degree on the left or west side for every degree into the
time zone they are. 

Not so.  The adjustment to be made requires a rotation around the
polar axis - you don't get that simply be lifting the east or west
side of the dial - that's equivalent to rotating around the horizontal
meridian line, which would take the gnomon out of the meridian plane.
The correct way to do this has been covered a number of times in The
Compendium - see in particular 3 articles on the topic in the March
2000 issue.

Fred



On Wed, Apr 29, 2009 at 10:41 AM, Thaddeus Weakley
thadweak...@yahoo.com wrote:
 Horizontal dials are very nice in that if they are made well to begin with,
 can easily be adjusted for any place in the world.  When mounting a
 mass-produced dial made for 40 or 45 degrees in the UK, simply place a wedge
 of sorts under the northern side to bring the gnomon angle up to the higher
 latitude angle.  Likewise the southern edge of the dial to lower the gnomon
 angle to match that of lower latitudes.

 And if a person wants to correct for longitude, they can tilt their dial up
 a degree on the left or west side for every degree into the time zone they
 are.

 Thad
 45.3N 73.3W

 --- On Wed, 4/29/09, Chris Lusby Taylor clusbytay...@enterprise.net wrote:

 From: Chris Lusby Taylor clusbytay...@enterprise.net
 Subject: Re: Are there any accurate mass-produced or reproduction
 horizontalsundials?
 To: sund...@rrz.uni-koeln.de, clar...@aol.com
 Date: Wednesday, April 29, 2009, 5:42 AM

 
 Hi Ken,
 The situation may be better in the USA, but here in the UK the main problem
 is that practically all garden centre horizontals I've seen (I try to avoid
 them) are made for a much lower latitude than our 50 to 58 degrees.
 My advice to people asking this question has been to go for an adjustable
 dial, which mostly means an armillary sphere, which is going to cost a lot
 more than $100.

 Several dialists with Web sites have published guidelines for purchasers:
 how to identify a good sundial by looking at its angles, the 6am-6pm line,
 noon gap and so on. There's been good discussion on this list, too - you
 could look in the archives.

 I'd say that the noon gap is likely to be the least of your problems.

 Good luck
 Chris


 - Original Message -
 From: clar...@aol.com
 To: sund...@rrz.uni-koeln.de
 Sent: Wednesday, April 29, 2009 9:47 AM
 Subject: Are there any accurate mass-produced or reproduction
 horizontalsundials?
 Hi everyone,
     Some people ask me for recommendations on what sundial to buy.   But
 most do not want to spend a lot of money.   Are there any mass-produced or
 reproduction horizontal sundials that are reasonably accurately made?
  Where the gnomon is on the 6 ‘o’clock line, with a noon gap, and both
 styles have a clean edge and under $100.00.
  A lot of museums sell the small 4 ½ inch diameter gray zinc sundial
 that looks like it is made correctly till you notice that there is no noon
 gap for only about $15.oo now.    If only it was made correctly.  I am
 looking for something larger for a garden.
 Thanks in advance,
 Ken Clark
 Elizabethtown, PA
 
 Big savings on Dell XPS Laptops and Desktops!
 
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Fwd: Geographical Sundial

[Fred Sawyer]

Fred Sawyer, Geographic Sundials (with Drawing A Geographic Sundial,
by Jacques Ozanam 1673), The Compendium - Journal of the North
American Sundial Society, Sep 1996, 3(3):5-10.



On Tue, Feb 10, 2009 at 2:09 PM, Lufkin, Bradley M (MS)
brad.luf...@ngc.com wrote:
 Some years ago there was an article in the NASS Compendium about a
 Geographical Sundial. Can anyone (perhaps the author) point me to that
 article?

 Thanks, Brad

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Leap second is back

[Fred Sawyer]

The Leap second is back - evidently the current administration's proposal to
eliminate them has not been adopted.

http://www.universetoday.com/2008/12/09/leap-second-to-be-added-to-world-clocks/
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David Shayt

[Fred Sawyer]

I have just learned:

Smithsonian Curator David Shayt died on Nov. 4 of multiple myeloma at
his home in Gaithersburg MD.  David served on the NASS board, was a
planner and host for our 1995 (first) conference held at the
Smithsonian, and gave us a narrated tour of the Latitude Observatory
in Gaithersburg on our 2007 conference.

Fred Sawyer
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Fwd: Need Help

[Fred Sawyer]

From: [EMAIL PROTECTED]
Date: Sat, Oct 18, 2008 at 10:03 AM
Subject: Need Help


 Good Morning Sir:

I need your help and advice.

I live in an upscale townhouse condo development. I have a 2 foot tall
pedestal which holds a large beautiful sundial. The association claims that
only plants can be added to any home. I plan to appeal this decision with
the argument that sundials are classic garden ornaments that can be found in
the most prestigious gardens around the world. What I am asking from you is
some text that supports my argument here. I am sure that there is something
out there but I need your help.

Thank you.

Dr. George A. Articolo





--
New *MapQuest Local* shows what's happening at your destination. Dining,
Movies, Events, News  more. Try it out!
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Re: Bernhardt's gnomons

[Fred Sawyer]

Oliver tends to get a bit more credit than he perhaps deserves as the
inventor of this type of gnomon.  See for example Lloyd Mifflin's U.S.
Patent 64892 (May, 1867) of an Equating Solar Chronometer - the key element
of which is the analemmic gnomon.

Fred Sawyer


On Wed, Sep 24, 2008 at 10:01 AM, Thomas Steiner [EMAIL PROTECTED]wrote:

 Dear all,

 I tried to collect information on Martin Bernhardt's special Gnomons
 which takes into account the equation of time in a equatorial sundial
 on a single scale to read off time, regardless of the date (almost -
 once a year the gnomon has to be changed).
 The idea is good and simple: just rotate half of the analemma (ok, a
 projection) around an axis. The original idea came from John Ryder
 Oliver (1834-1909) and Bernhardt lived from 1919 until 2000. It's
 incredible that this was discovered that late. Do you know any sources
 or other information on it? Do you know of any ideas/inventions that
 were close? What did Oliver exactly do? ...

 For the German speaking among you, I wrote major parts of this smal
 wikipedia article:
 http://de.wikipedia.org/wiki/Bernhardtsche_Walze

 Thanks for help on anything related to the subject...
 thomas
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Re: Bernhardt's gnomons

[Fred Sawyer]

To see Mifflin's patent, go to:

http://www.google.com/patents?id=kX4AEBAJpg=PA4lpg=PA4dq=%22equating+solar+chronometer%22source=webots=V3YY1BCx8fsig=HZ2t_vudn-Iz-hFPPrWMJShOcMghl=ensa=Xoi=book_resultresnum=1ct=result#PPA3,M1



On Wed, Sep 24, 2008 at 10:01 AM, Thomas Steiner [EMAIL PROTECTED]wrote:

 Dear all,

 I tried to collect information on Martin Bernhardt's special Gnomons
 which takes into account the equation of time in a equatorial sundial
 on a single scale to read off time, regardless of the date (almost -
 once a year the gnomon has to be changed).
 The idea is good and simple: just rotate half of the analemma (ok, a
 projection) around an axis. The original idea came from John Ryder
 Oliver (1834-1909) and Bernhardt lived from 1919 until 2000. It's
 incredible that this was discovered that late. Do you know any sources
 or other information on it? Do you know of any ideas/inventions that
 were close? What did Oliver exactly do? ...

 For the German speaking among you, I wrote major parts of this smal
 wikipedia article:
 http://de.wikipedia.org/wiki/Bernhardtsche_Walze

 Thanks for help on anything related to the subject...
 thomas
 ---
 https://lists.uni-koeln.de/mailman/listinfo/sundial


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Fwd: Mac sundial design program?

[Fred Sawyer]

I'm forwarding this for Roger Bourke.  I know the question has come up
before.  Perhaps a listmember who is familiar with Macs can respond to
him offline.  Thanks.

Fred Sawyer


-- Forwarded message --
From: Roger, Margaret  Forrest Bourke [EMAIL PROTECTED]
Date: Thu, Aug 28, 2008 at 2:47 PM
Subject: Mac sundial design program?
To: [EMAIL PROTECTED]


Anybody know of a sundial design program that will run on a Mac?

Roger, Margaret  Forrest Bourke
Box 8083
Alta, Utah 84092-8083
801-742-9800
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Midnight sun on Mars

[Fred Sawyer]

Midnight sun on Mars:

http://www.universetoday.com/2008/07/23/phoenix-in-the-land-of-mars-midnight-sun/
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Midnight sun on Mars

[Fred Sawyer]

Midnight sun on Mars:

http://www.universetoday.com/2008/07/23/phoenix-in-the-land-of-mars-midnight-sun/
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Updated Compendium article

[Fred Sawyer]

The March issue of the North American Sundial Society's publication
The Compendium includes the latest installment in a series of articles
by Bob Kellogg on Sundials for Starters.  This article covers solstice
and equinox lines and deals specifically with vertical sundials.
However, figures 1 and 2 of the article may lead to some confusion
because the gnomons in those figures appear to be oriented as on a
horizontal sundial.

In order to forestall any confusion, Bob has provided revised figures
which simply rotate the gnomon through 90 degrees and make it clear
that we are dealing with the gnomon on a vertical dial.

We have extracted the updated article from The Compendium and have
posted it for free download at http://sundials.org/compendium/bonus.

We encourage everyone who receives The Compendium, whether in print or
digital formats, to download this article to avoid any confusion.

Fred Sawyer, editor   Bob Kellogg, author

(With thanks to Tony Moss for bringing this to our attention!)
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NASS Conference Date

[Fred Sawyer]

A message for anyone interested in attending the NASS conference:

The next annual NASS conference will be held Aug. 7-10, 2008 in St. Louis, MO.  
Mark your calendars!

Fred Sawyer---
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Re: New book

[Fred Sawyer]

Hi Gianni,

The book is available on Amazon.fr - but they list the title differently:

http://www.amazon.fr/Cadrans-Solaires-Forissier-Philippe/dp/2910868753/ref=sr_1_4?ie=UTF8s=booksqid=1196345697sr=8-4

Best,

Fred



On Nov 29, 2007 6:57 AM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:

 In the last issue of The compendium, received yesterday,  I have read
 that in France has been published  the new book   :
  Les ombres et les
 heures dans l'antiquité  by Philippe Forissier

 I have tried to
 look for it in Amazon.fr http://amazon.fr/ and in the publishing house
 site
 (http://www.
 actes-graphiques.com) but nobody knows it.

 Some French friend has a
 different address where it is possible to find this book?

 Thanks
 A
 regard
 Gianni Ferrari


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Re: New book

[Fred Sawyer]

Gianni,

The full title of the book - on the cover - is:

Les ombres et les heures dans l'antiquite, ou les origines DES CADRANS
SOLAIRES

Amazon.fr has only picked up the last 3 words that appear in large type on
the cover.

Fred



On Nov 29, 2007 6:57 AM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:

 In the last issue of The compendium, received yesterday,  I have read
 that in France has been published  the new book   :
  Les ombres et les
 heures dans l'antiquité  by Philippe Forissier

 I have tried to
 look for it in Amazon.fr http://amazon.fr/ and in the publishing house
 site
 (http://www.
 actes-graphiques.com) but nobody knows it.

 Some French friend has a
 different address where it is possible to find this book?

 Thanks
 A
 regard
 Gianni Ferrari


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Fw: sundials article

[Fred Sawyer]

- Original Message - 
From: Fred Sawyer [EMAIL PROTECTED]
To: Sundial List sundial@uni-koeln.de; [EMAIL PROTECTED]
Sent: Tuesday, November 06, 2007 10:18 AM
Subject: Fwd: sundials article


 An article from Denis Roegel.
 
 -- Forwarded message --
 From:  [EMAIL PROTECTED]
 Date: Nov 6, 2007 9:56 AM
 Subject: sundials article
 To: [EMAIL PROTECTED]
 Cc: [EMAIL PROTECTED]
 
 
 Dear Mr. Sawyer,
 
 I have recently written an article on sundials, and I wanted
 to let the sundials email list know about it, but since
 I am not subscribed, my message apparently didn't get through
 (although it didn't seem to be rejected). Anyway, as I think
 my article might interest other people, and since I see your
 name appearing on the list, I thought you might want to let
 the list know, or perhaps mention my work in the NASS bulletin.
 
 Here is the link:
 
 http://www.loria.fr/~roegel/TeX/article-sundials.pdf
 
 Thanks,
 
 Denis Roegel

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Re: bone terrestrial globe with sundial

[Fred Sawyer]

I happen to own a small version of this exact item.  I must concur with Sara 
that it is not what it purports to be.  I picked up the small (about 5 high) 
version a few years ago as a curiosity - lamenting all the time that the gnomon 
design and placement make the whole thing useless.  This is almost definitely a 
modern attempt (made in several different sizes!) to put one over on emptores 
who ignore the caveat!

Fred Sawyer

  - Original Message - 
  From: Sara Schechner 
  To: Josef Pastor 
  Cc: Sundial List 
  Sent: Friday, October 12, 2007 11:08 AM
  Subject: bone terrestrial globe with sundial


  Hello fellow dialists,

  I am very dubious about the ivory  (or bone) globe with the inset sundial on 
a number of grounds--cartographically, horologically, and stylistically.

  First cartographically, I do not see this globe as dating from around 1600.  
The first thematic map showing trade winds was by Edmond Halley in 1686, and an 
early example of trades winds marked by scattered arrows was that of William 
Dampier published in 1699.  I also do not feel that it is in keeping with other 
cartography in terms of style and information of the 17th century   It seems a 
mishmash of information and languages.  But I don't buy the idea that many 
hands made this item, adding to it at different times.  I think a single person 
did it by borrowing from different sources.  The weight of the engraving is the 
same throughout.

  Second, horologically, I need not tell this group that the gnomon is 
misaligned and misplaced.  There is no evidence of it ever being correctly 
placed, and the metal slot for it suggests that it was intentionally put where 
it is now.  No competent  sundial maker or user of this accessory (alleged to 
have been added to the earlier globe in the late 18th century) would have set 
it up this way.  Moreover, the style of decoration and lettering of the 
horizontal dial is different from that used for the globe.  And are we supposed 
to think that the early globe was sawed in half at this later date?  The marks 
on the globe do not suggest this rough treatment.  

  The stand appears to be a marriage of later parts.  

  All in all, it makes me queasy.  

  I have seen small ivory globes, ivory globe sundials, small compass sundials 
inside turned ivory spheres the separate into two hemispheres, and even a 
compass sundial inside a small ivory celestial globe from the early 17th 
century.  This last item is in the British Museum.  None look anything like 
this.

  Caveat emptor.

  Sara
  Lat 42.4N  Long  -71.1W



  On 10/10/2007 7:31 PM, Josef Pastor wrote: 
Dear Diallists,



Exclusive Sundial Offer at EBAY. Does anybody have background knowledge 
concerning this sundial?




http://cgi.ebay.com/Antique-Globe-engraved-in-Bone-with-Sundial-inside_W0QQitemZ250174150059QQihZ015QQcategoryZ63593QQcmdZViewItem
 



Kugelsonnenuhr in Genthin (Germany): Altenplathower Sonnenuhr (1810) soll 
von Schweizer Fachmann restauriert werden:




http://www.volksstimme.de/vsm/nachrichten/lokales/genthin/?sid=0e2db9ab8943a7c818ad1c0fe9114797em_cnt=472182
 

   Best regards

Josef Pastor 




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-- 
Sara Schechner, Ph.D.
David P. Wheatland Curator
Collection of Historical Scientific Instruments
Department of the History of Science
Harvard University, Science Center 251c
1 Oxford Street, Cambridge, MA 02138
Tel: 617-496-9542
Fax: 617-496-5932

--


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Re: Old dial design article

[Fred Sawyer]

In fact, that is the June dial on the NASS 2008 Photo Wall Calendar 
distributed at the recent conference.

Fred Sawyer


- Original Message - 
From: Roger Bailey [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; Sundial List [EMAIL PROTECTED]
Sent: Wednesday, October 10, 2007 6:35 PM
Subject: Re: Old dial design article


 Hi Dave,

 Thanks for the link. I am happy to here the multifaceted Baltimore dial is
 still there and in the NASS registry. See
 http://www.sundials.org/registry/regphotos/091.htm

 Regards, Roger Bailey


 - Original Message - 
 From: [EMAIL PROTECTED]
 To: Sundial List [EMAIL PROTECTED]
 Sent: Wednesday, October 10, 2007 11:34 AM
 Subject: Old dial design article


 Interesting article from a 1949 Mechanix Illustrated...

 http://tinyurl.com/37ff9x

 Dave
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Cultivating Life

[Fred Sawyer]

Culivating Life with Sean Conway is a television program that appears on 
Public TV stations around the U.S.  The show focuses primarily on gardening and 
is now in its second year.  Episode 20 this year has the Sun as its focus:

CLLF 220 Sun - From plants that can bake in the sun and cooking with sunchokes 
to the history of sundials and using the sun to photograph your favorite 
plants, Cultivating Life lets the sun shine in. Plus kinetic art that changes 
with the movement of the sun and wind.

The history of sundials segment is a brief interview with Fred Sawyer about 
dials - including some nice photography of several different dials - ranging 
from very old to very new.  The commercial dials that show up and might be 
familiar to members of the Sundial List include Carlo Heller's Icarus dial and 
the Aten Heliochronometer.

Airing of the episodes will depend on your local station.  In Connecticut, 
episode 20 is scheduled for mid December - but it may show up earlier in other 
locations.  

http://www.cultivatinglife.com/index.php

Fred Sawyer
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Gatty's Book of Sun-Dials

[Fred Sawyer]

Dialists who have always wished they could get a printed version of Mrs. 
Gatty's Book of Sun-Dials (the last and best edition came out in 1900) at a 
reasonable price will be interested to learn that the book has recently been 
reprinted in both paperback and hard cover editions by Kessinger Publishing LLC 
(specialising in reprints of rare books).

To see both options on Amazon, try:

http://www.amazon.com/Book-Sun-Dials-Collected-Alfred-Gatty/dp/other-editions/0548135649/ref=dp_ed_all/104-7954989-1105530?ie=UTF8qid=1190317403sr=1-23

Fred Sawyer
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Re: Sundial park in Ghent?

[Fred Sawyer]

Doug,

If they're going to be in Belgium, they should also look into the Sundial 
park in Rupelmonde (near Antwerp).

Fred Sawyer


- Original Message - 
From: Douglas Bateman [EMAIL PROTECTED]
To: Sundial List [EMAIL PROTECTED]
Sent: Saturday, July 21, 2007 12:15 PM
Subject: Sundial park in Ghent?


 Two of the BSS members are planning visit to Belgium and have heard
 that there is sundial park, but cannot find any information about it on
 the internet.

 Any advice or links will be appreciated.

 Many thanks, Doug

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Re: Help Oscar!

[Fred Sawyer]

Roger,

There's a direct solution to this problem - but it seldom if ever shows up 
in dialing texts.  Since it's so seldom presented, I thought list members 
might be interested in seeing the equation.  I've attached a very small pdf 
that gives the equation (in my preferred form - there are actually several 
ways to attack this) and solution for this particular instance.


Fred Sawyer


- Original Message - 
From: Roger Bailey [EMAIL PROTECTED]
To: Sundial Mailing List sundial@uni-koeln.de; Frank King 
[EMAIL PROTECTED]

Sent: Wednesday, July 11, 2007 12:26 PM
Subject: Re: Help Oscar!


This advice is good as far as it goes but if the class repeats the
experiment with a vertical gnomon six months later they will find that the
hour lines are very much different. Will this destroy their trust in
science?  I hope not and their teachers will use this as an opportunity to
introduce another topic, the sun and seasonal change. The ancients building
megaliths etc learned a lot about their world by observing the sun.
Unfortunately a lot of fires were burned and virgins sacrificed to get the
sun to come back. The important thing for teachers today is to get the kids
to keep asking why and not to take things on faith from all knowing
teachers.

A little quiz is appropriate here. Calculate the time for the sun to be at a
azimuth of 45º for the summer and winter solstices for a given latitude, say
50º. The difference is remarkable. I found solving this particular solution
of spherical trigonometry somewhat more difficult than the usual solutions
where the time is known and altitude and azimuth are calculated.

Regards,
Roger Bailey


SolveforT.pdf
Description: Adobe PDF document
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Re: Fred's Sundial Tower

[Fred Sawyer]

John,

Thanks for highlighting the photo of the sundial tower!

But please don't call it the Fred Sawyer Sundial Tower - the people at the 
university wouldn't have any idea who you were talking about.  I don't know if 
it has an official name, but it is on the Engleman Science Building. 

Please also change the descriptive note to show that it is at SCSU (not CCSU).  
There has been some confusion about this - confusion that I think I started by 
originally typing CCSU in an announcement simply because I live so much closer 
to Central (CCSU) and am more familiar with it than I am with Southern (SCSU).

Thanks.

Fred



  - Original Message - 
  From: John Carmichael 
  To: 'Sundial List' 
  Cc: 'Fred Sawyer' 
  Sent: Wednesday, July 04, 2007 1:57 PM
  Subject: Fred's Sundial Tower


  Hello All:

   

  We finally have a good photo of Fred Sawyer's magnificent new sundial tower 
at Central Connecticut State University, New Haven, CT USA.  It is our Sundial 
Tower of the Month at 
http://www.advanceassociates.com/Sundials/Stained_Glass/CupolaSundial/SCTC_Images.html
  This photo was taken by Fred on the Summer Solstice.

   

  John

   

   

   
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