Try pieces of scrap pipe. I acquired a short piece of 14 inch 316 stainless
steel scrap pipe and cut it into rings with a hacksaw. The hand sawing and
filing were slow processes but the pipe sections eventually formed a
beautiful equatorial sundial.
Roger Bailey
of Calgary were below the horizon. In the winter, the colder air
caused more refraction and the lights of the city popped up and spoiled his
view. He moved back east.
Roger Bailey
At 10:32 AM 3/24/98 MET, Wolfgang R. Dick wrote:
The problem exists only in our head
altitude.
Cheers, Roger Bailey
than sundials.
Enjoy your trip, Roger Bailey
At 08:27 PM 7/7/98 -0700, Tom Kreyche wrote:
I will be visiting Beijing in early August on business and will take a few
extra days for sightseeing. Does anyone know of any museums or sights of
interest related to dialing?
Thanks,
Tom Kreyche
melted into a vertical and horizontal planes.
The gnomon could be a scythe, gun or other other weapon of man's destruction.
It is important that we translate these classical themes of art, science
and literature of sundial design into this modern age of technology and chaos.
Right ;-)
Roger Bailey
this site!
Roger Bailey
See Helix Helios at http://www.egeskov-slot.dk/map/sun_dial.html for a
wonderful helical dial by Piet Hein. It is at Egeskov Castle in Denmark.
Thanks Daniel Roth for including it on sundial links
Roger Bailey
At 05:07 PM 8/28/98 +0100, Les Cowley wrote:
David Higgon's solution and mine reduce
?
Maybe Novell will sponsor a prize for the best answer.
Roger Bailey
Walking Shadow Designs
N 51:05 W 115:22
At 09:11 PM 9/22/98 -0700, Ramon L Holt wrote:
I got junk mail that included a picture of an interesting design for a
sundial that certainly wouldn't survive for more than a hour
Cos t, for Altitude = 0.
For a more accurate result, solve the more complicated equation for an
altitude of - 48' (~16' for semi diameter and ~32' for typical refraction).
I will forward some previous postings on this topic.
Roger Bailey,
Walking Shadow Designs,
N51:05 W 115:22
At 08:05 AM 10
in Sudbury, Ontario,
Canada.
Those subscribing to the sundial mailing list should have a look.
Roger Bailey
Walking Shadow Designs
N 51:05 W115:22
-ordinates.
Roger Bailey
.
Roger Bailey
N 51:05 W 114:22
connected to the sea. The height of water in the well would vary with the
tides. This could be used to drive a mechanism to shift the dial to correct
for the lunar equation of time. Do I have an invention here? Rube Goldberg
probably beat me to the patent office.
Roger Bailey
Walking Shadow
for the sunset tee shirt. Two versions of the
original concept with just the Sunset Equation Cos T = - Tan (Dec) *
Tan(Lat) were displayed at the NASS meeting in Seattle last September. We
have an improvement for next year which shows not just when but where and
how sunrise and sunset occur ;-)
Roger Bailey
is smaller and easy to read view with a normal browser. The bit map
file is better quality.
Either one will help make sense of the previous discussion on when, where
and how sunset occurs.
Roger Bailey
Walking Shadow Designs
51 N 115 W
tables on the inside front cover of the Nautical Almanac were
computed by the equation D = 0.97 * sqrt h in feetMinor discrepancies
... are not important in practical navigation.
I would add and even less so in the design of sundials. Sunset phenomenon
are not that precise.
Roger Bailey
. A
couple are: http://pw2.netcom.com/~flzhgn/grnray.htm for pictures, or
http://mintaka.sdsu.edu/GF/index.html for the Green Flash Home Page.
How many of you have seen the phenomenon?
Roger Bailey
Walking Shadow Designs
51 N 115 W
(and surrounded by the Rocky Mountains which give local sunsets
been within half a degree.
I will re-post the cautionary notes as well.
Roger Bailey
Vertical declining dials like those that decorate houses in the alpine
villages of Europe are my favourite style of sundial to design and build.
With programs like Fer de Vries' Zonwvlak or Francois Blateyron's
.
Roger Bailey
Walking Shadow Designs
N 51 W 115 and more that half way to the North Pole
At 09:59 AM 3/8/99 -, The Shaws wrote:
I am rather disappointed to learn that there isn't an
actual pole sticking out of the earth at the South pole to
mark the spot. I wonder if there is one
at various times through the day. On a
horizontal surface these points will define a straight east west line.
Roger Bailey
Walking Shadow Designs
N 51 W 115
In the heart of the Rocky Mountains where the first day of spring is truly
an exceptional day.
advice.
Roger Bailey
Walking Shadow Designs
51 N 115 W
At 06:08 PM 3/20/99 +0100, Mr.Pace wrote:
Hello all there I would like to know if someone has ever done any dial
design using AutoCAD or some other CAD software - i think it would prove
pretty accurate to draw and plot/print the results
I have read of sun compasses being used by arctic explorers. Near the
magnetic pole the horizontal component of the magnetic flux is weak and
magnetic compasses are not reliable. For half the year a sun compass would
be useful.
Roger Bailey
Walking Shadow Designs
N51 W 115
At 11:04 PM 3/22/99
programable calculators if anyone is interested.
Roger Bailey
Walking Shadow Designs
51 N 115 W
where I am enjoying a wee dram and feeling my age ;-)
everone subscribing to
this list is fluent in spherical trigonometry before posting a note
containing equations? No! People will read and enjoy what they understand.
If this challenges others to learn something new, good, the communications
have served a useful purpose.
Roger Bailey,
Walking Shadow
session of real time chat over the net .
Alexei Pace
Please, no chat! Leave some time for people to read, understand and compose
their thoughts before responding.
Roger Bailey
is there. Who is going to build the first technicolour
sundial utilizing the low cost diffraction gratings available on old CDs?
For background start with http://129.82.166.181/CD_Spectroscope.html for
the University of Colorado's Little Shop of Physics.
Roger Bailey
Walking Shadow Designs
N 51
their obelisks
with spheres.
Cheers from a swelled headed, nit picking, old timer,
Roger Bailey
Walking Shadow Designs
N 51 W 115
*where triggering an avalanche is not just a figure of speech!
, practical
device that will not cause blindness among its users.
Roger Bailey
Walking Shadow Designs
N 51 W 115
At 12:31 AM 5/3/99 -0400, [EMAIL PROTECTED] wrote:
As a test, you could make use of a device I read about called a Shadow
Sharpener, supposedly used by Chinese astronomers centuries ago
Hi John,
You believe that you are right. The attached sketch (Shadow.jpg) shows this
fairly clearly. At 21 kb it is too big to post on the mailing list unless
there is a strong demand.
Roger Bailey
At 06:45 AM 5/4/99 -0700, you wrote:
Hello all:
I was just thinking that on a horizontal
equatorial) but it is
sufficient precise for arranging trysts.
Roger Bailey
Walking Shadow Designs
N 51 W 115
.
Roger Bailey
Walking Shadow Designs
N 51 W 115
on this
mailing list has taught me.
Roger Bailey
At 09:31 AM 5/14/99 -0700, Arthur Carlson wrote:
I'm willing to (brashly) bet there was never a pilot who ever used these
techniques or even took them seriously. Knowing your latitude and longitude
without a map is useless, and if you have a map
/~roth/slinks.html.
I also recommend the web site to those on sundial mailing list. Have a look.
The magazine also has an article on solar observing that confirms and
expands on the techniques described by Bill Maddux in his posting Solar
Images
Roger Bailey
Walking Shadow Designs
N 51:05 W115:22
Thank you Richard. What an excellent ode on retirement. Your second posting
is an excellent warning on the security and privacy of e-mail.
Score another point for the eclectic nature of this list.
Roger Bailey
Here it is. It's a bit more dialectal than you remember! ;-)
Chant-Pagan
and not the plane of the wall. A clever solution. Thanks Woody.
Roger Bailey
Walking Shadow Designs
N 51 W 115
Tony Moss wrote:
Arising from Luke's suggestion a word of warning to the unwary who might
omit to fill the space between the hourlines as he suggests. Don't
forget that if you use hourlines which
Thanks Tom,
URLs are unforgiving. The correct URL for the sundial is
http://www.phys.washington.edu/edu/Department/tour/sundial.
Roger Bailey
At 03:02 PM 7/3/99 -0400, you wrote:
Hi Roger,
My Netscape can' t find:
http://www.astro.wahsington.department/tour/sundial
or
http
Thanks Tom,
URLs are unforgiving. The corrected correct URL for the sundial is
http://www.phys.washington.edu/Department/tour/sundial.
Roger Bailey
is wide open for innovative interior sun sculptures.
Roger Bailey
Walking Shadow Designs
N 51 W 115
R1 Dover Publications ISBN 0-486-22947-5
R2 ISBN 2-9505792-5-6
At 02:47 PM 8/2/99 -0700, Abbie Lewis wrote:
My message is for anyone who has heard of, or knows about, an interior
sundial
://www.mapblast.com In the US you can put in your street address and
get back a map showing the latitude and longitude. In other parts of the
world you have to move the icon to your precise location but you can still
get a reading of your coordinates precise to 4 decimal places.
Roger Bailey
Walking
with a
presentation on Sunset Phenomena.
Or you could say it is dark when the street lights come on. When I was
growing up in Norman Rockwell Land, when the street lights came on, it was
dark and we all had to go home.
Roger Bailey
Walking Shadow Designs
N 51 W 115
design tools for so
many things including sundials. It is difficult to learn their how to use
them for more than a small fraction of their capability. I need all the
tips I can get, even if it is just asking the right question and learning
what cannot be done.
Roger Bailey
Walking Shadow Designs
N
had made the mistake of looking at Jupiter through one of these
big Dobs. The brilliant image destroyed my night vision.
Cheers,
Roger Bailey
N 51 W 115
, where and
how the sun sets. This is why I had the formulae at hand. I plan end the
talk with a revised tee shirt design including the three formulae for when,
where and how the sun rises or sets.
I am glad you liked the idea and made up a tee shirt.
Roger Bailey
N 51 W 115
At 07:46 PM 9/11/99
that it is the third angle of the
triangle PFZ.
You win the Psi Challenge.
Roger Bailey
At 07:52 AM 9/28/99 -0800, you wrote:
Roger Bailey wrote:
Sorry but I do not see the basis for these assumptions.
Hi Roger,
So again looking at fig.26 in Smart,
segment LF is by definition angle LPF (the HA
L x Tan t.
Roger Bailey
Walking Shadow Designs
N 51 W 115
vacation.
A bientot,
Roger Bailey
N 51 W 115
* Check the Artisme catalogue
** Not on the classic Pont Valentre, the signature for Cahors, but the
N20-E09 viaduct over D27
to be most appropriate, in
particular various versions of Sun Patches.
An alternative choice would have been the Beatles recording of Here Comes
the Sun and The Fool on the Hill
Roger Bailey
On the Hill at N 51 W 115
more fun. Were you more successful?
Roger Bailey
N 51 W 115
)At 12:32 AM 11/11/99 +, Tony Moss wrote:
Fellow Shadow Watchers
Continuing my occasional series of practical approaches for metal sundials
here is a distillation of my personal notes on anodising aluminium prepared
over many years
but the works of the
earlier civilizations. The Renaissance was based on this collected knowledge.
Roger Bailey
N 51 W 115
correct. Too bad he also concluded that the earth is in the middle of the
heavens and the earth does not in any way move locally. However Ptolmey's
theory of the universe and mathematics work quite well for sundial design.
Roger Bailey
N 51 W 115
URL correction: See
http://www.swan.ac.uk/astra/astro/essays/flamsteed/flamsteed.htm.
Spelling Correction: The Almagest
Roger Bailey
N 51 W 115
makes and sells something very similar, using some of your
ideas, incorporated in their design.
Roger Bailey
Walking Shadow Designs
N 51 W 115
At 08:31 AM 11/28/99 -0700, John Carmichael wrote:
Hello all:
Hope all you Americans had a wonderful Thanksgiving!
I have been having a discussion
.
Roger Bailey
N 51 W 115
At 03:28 PM 11/30/99 -0600, William P Thayer wrote:
I bought this about a month ago and wade thru a few pages of it every
night (it's on my nightstand). The translation is wonderful, as far
as I can tell; exactly what a first-rate author like Ptolemy deserves.
I
pictures are JPEG, they are already well compressed. Can I get
added to your list Tony?
Cheers,
Roger Bailey
N 51 W 115
C x Sin A.
QED.
Roger Bailey
N 511 W 115
At 02:21 PM 12/16/99 -0500, Debra Lopez William Gottesman wrote:
12/16
I have been trying, on and off, for the past year to create a really nifty
algorithm to easily achieve perfect alignment of a sundial with the earth's
axis, just by comparing 3 time
. By
the moon, a reading of 10:00 will be 10:00 pm. The solar shadow in the will
be in the same position at 10:00 am.
What about the declination? I know it will be large and positive but does
anyone here know the lunar declination on 21/22 Dec when the moon is full?
Roger Bailey
N51 W115
earlier.
For an explanation of the spherical trigonometry, see my previous posting
at http://dialist.webjump.com one of the sites David Bell set up for
storing attachments.
Happy Solstice,
Roger Bailey
N 51 W 115
screaming that The sky
is falling! and flying to Mexico on Saturday, 1/1/00.
Roger Bailey
drawings into Word or Excel to finish with text. This works
better for me that dxf files imported into the cheapo CAD program I've try
to use.
Roger Bailey
N 51 W 115
. This made the
basic design very easy. Maybe I should also add the sidereal time option
suggested by Karl Schwarzinger. Star time on a sundial! Now that would
really impress a bunch of astronomers.
Roger Bailey
Walking Shadow Designs
N 51 W 115
a sundial and use this as a guide
for their observations. This is why it may fit for the RASC site of the
Alberta Star Party.
Roger Bailey
Walking Shadow Designs
N 51 W115
Isn't Beltane the other side of Candlemas?
I am looking forward to an authoritative answer based on solar declination.
Roger Bailey
N 51 W 115
At 08:56 AM 5/24/00 +0100, John Davis wrote:
Hi John,
Please excuse my ignorance, but what is Beltane?
John
at the Calgary Science Center are not available as I have
not scanned them. I would also have to get model releases from my
grandchildren!
Roger Bailey
Walking Shadow Designs
N 51 W 115
At 07:29 AM 8/8/00 -0700, John Carmichael wrote:
Hello all:
I have been asked to design an analemmatic interactitive
on this concept. Look for the NASS Madjet in the
latest NASS Compendium (7-2). The nested ellipses form a striking design
which they interpret from Egyptian mythology as Madjet, the papyrus sun
boat on which Ra daily carries the great sun disk across the sky.
Roger Bailey
Walking Shadow Designs
N 51 W 115
? is it
vandal proof? will joggers and dog walkers trip on the stones? how much
will it cost? ... etc. This may limit the implementation. I will keep you
posted.
Roger Bailey
Walking Shadow Designs
N 51 W 115
At 09:56 AM 8/11/00 MET, Frans W. MAES wrote:
Picking up the thread on the analemmatic dial
it. Ah for the good old days,
back it the last millennium.
Cheers,
Roger Bailey
Walking Shadow Designs
N 51 W 115
of next? Sundials at
airports to show VFR pilots the hours til sunset?
Actually a sundial at a railway station would be an excellent way to teach
the history of time from local solar time to standard railway time.
Roger Bailey
Walking Shadow Designs
N 51 W 115
At 08:33 PM 2/9/00 EST, [EMAIL PROTECTED
six fingers.
Reality, as usual, is a little off. Nothing is perfect.
Roger Bailey
Walking Shadow Designs
N 0.89 rad, W 2.00 rad
and shadow shows built into solar oriented structures? Do you know of any
good references to more complete technical analyses of the phenomenon at
Chichen Itza?
Roger Bailey
Walking Shadow Designs
N 51 W 115
Please note the new address. My ISP (banff.net) went bankrupt.
onto
the vertical edge of the staircase.
Roger Bailey
51 N 115 W
At 07:56 AM 1/22/00 -0600, Warren Thom wrote:
Hi Roger,
The Mayan pyramid sounds interesting. Thanks for posting. I had a problem
with the link in your message. I did find the following:
http://www.mont-acad.pvt.k12.al.us
useful to this world wide community of interest.
Roger Bailey
Walking Shadow Designs
N 51 W 115
At 09:44 AM 7/4/00 +0100, John Davis wrote:
Hi Dialling Colleagues, I'm pleased to announce that the first edition
of e BSS Sundial Glsary is now available. Printed versions
can
attack US satellites - wouldn't that include
the GPS system?
I guess this would reduce us all to the most fundamental system of
navigation, Dead Reckoning.
Roger Bailey
Walking Shadow Designs
N 51 W 115
of time effect as well as the latitude effect and longitude
correction.
Check it out.
Thanks Robert for the addition to a great web site.
Roger Bailey
Walking Shadow Designs
N 51 W 115
by a relative who knew I was interested dials. My only modification is to
tilt it 11 degrees to correct for latitude. The pattern must have been
copied from an original design that used nought for noon. I would be
interested to learn the source of the original.
Roger Bailey
Walking Shadow Designs
n 51 W 115
.
Roger Bailey
N 51 W 115
of the gnomon on the cylinder surface
for each hour line.
This may take some time as a cloud will pass just as the time gets critical.
Roger Bailey
Walking Shadow Designs
N 51 W 115
.
Roger Bailey
Walking Shadow Designs
N 51 W 115
At 05:54 PM 3/3/00 +, Tony Moss wrote:
Fellow Shadow Watchers,
Professor Noel Dilly and Sarah Edmondson-Jones
recently exchanged ideas about materials for sundial making which called
to mind being asked to make
a cone around the style axis?
You are correct, the orthographic projection technique works but it is a
tedious procedure to establish sufficient points to fix the hour lines.
Maybe I should have another look at the mathematical solution.
Roger Bailey
Walking Shadow Designs
N 51
At 07:49 PM 3/4
fashion method is better for
finding south than a modern GPS.
Roger Bailey
of the sun to
the northern hemisphere, the end of winter and the first day of spring.
Roger Bailey
Walking Shadow Designs
51 N 115 W
The original (corrected) posting follows.
A highlight of my recent trip to Mexico was the Mayan ruins at Chichen
Itza, in particular, El Castillo, the Temple
As usual , there is an error in the URL. Add an s to longwoodgarden, a g to
or and an l to htm. The correct URL for the paper Of Sundials, Mean Time
and the Analemmatic Sundial is
http://www.longwoodgardens.org/Sundial/Analemma.html.
Roger Bailey
. It
was an interesting visit for all parties.
If someone in the area is interested in a contract to restore the dial, I
can provide details and the address.
Regards,
Roger Bailey
Walking Shadow Designs
N 51 W115
appreciate the work being done by the Commission des Cadrans Solaires
in publishing the catalogue and encouraging the preservation of le
patrimoine gnomonique francais.
Roger Bailey
N51 W 115
The english text is:
A Manoir History, a Castle Destiny.
Built in 1572 for the Consul Pierre Isnard
of Dom Manuel I.
My advice to travellers remains the same. Search for sundials. It is amazing
where that search can lead you. This topic on armillary spheres warrants
further exploration.
Roger Bailey
Walking Shadow Designs
N 51 W 115
is one of the things that led to my interest in sundials.
Roger Bailey
N 51 W 115
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Daniel Lee Wenger
Sent: February 15, 2001 11:05 AM
To: sundial@rrz.uni-koeln.de
Subject: Re: Armillary Spheres in Portugal
Thanks for posting the address. It is an excellent site. A quick search on
the Epact site for armillary spheres, my current topic of interest, turned
up over a dozen fine examples.
Roger Bailey
Walking Shadow Designs
N 51, W 115
-Original Message-
From: [EMAIL PROTECTED]
[mailto
transformations at
http://home.iae.nl/users/ferdv/compute.htm . This outline is very useful in
understanding his techniques and providing the mathematical logic for others
to use in their own programs.
Your simple question does not have a simple answer. I hope this helps.
Roger Bailey
Walking Shadow Designs
N
slide rules, are four pocket calculators
and two calculator watches, all with dead batteries. I continue to use a
cheap little solar powered scientific calculator (TI-25X) for sundial
calculations.
Roger Bailey
Walking Shadow Designs
N 51 W 115
ps. I will be staying at this location for some time
, a modern digital deviceshowing zoneless local
time, a replacement forall those old analogartefacts that only work
on those rare times when the sun is shining.
Roger
Bailey
-Original Message-From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On
Behalf Of A.BrownSent: March 28, 2001 3:59 PMTo
. It is not a difficult programming task. The mathematical
algorithms are well known, but I do not know of anyone who has offered the
table of outputs that I think you are looking for.
Roger Bailey
Walking Shadow Designs
51 N 115 W
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL
degrees so the denominator must be zero.
Then Sin Lat x Cos t must equal Cos Lat x Tan Dec. QED
I hope this will help us get past our solar noon fixation.
Roger Bailey
Walking Shadow Designs
N 51.0842 W 115.3775
from sunrise to sunset is exactly 12 hours. These orientations
were determined by Dr. Gordon Freeman of U of A and published about 10 years
ago. See
http://www.ucalgary.ca/UofC/faculties/SS/ARKY/Dept_Files/papers.html#4 for
the abstract of proposed paper by Gordon Freeman on a related topic.
Roger
for over an hour before the cold forced a retreat back
to bed.
This celestial display lived up to the predictions in the popular press, a
rare event these days. I hope others around the world were able to share
this experience.
Roger Bailey
Walking Shadow Designs
N 51 W 115
are having fun!
Roger Bailey
Walking Shadow Designs
N 51 W 115
Further details on Sunset Phenomenon are contained in my 1999 NASS
presentation, a 394 kb PowerPoint (ppt) file. I would be happy to send a
copy as an email attachment to you and others upon request.
-Original Message-
From: [EMAIL
.
Roger Bailey
-Original Message-
From: Edley [mailto:[EMAIL PROTECTED]
Sent: December 5, 2001 2:35 AM
To: Roger Bailey
Cc: sundial@rrz.uni-koeln.de
Subject: RE:RE: Interval Timers?
I had slipped in a parenthesis saying it was true in the equatorial
plane, and that would be mostly true as you
.
Happy Solstice
Roger Bailey
Walking Shadow Designs
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of John Schilke
Sent: December 18, 2001 3:26 PM
To: Sundial Mail List; Judy Young
Subject: Fw: Query about solstices
Greetings!
It occurred to me today
up Scotty; it is getting dangerous here.
Roger Bailey
Walking Shadow Designs
N 51 W 115
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Dave Bell
Sent: January 5, 2002 11:05 AM
To: Sundial Mail List
Subject: Re: Ceiling Sundials: Mirror Placement
in the basement. I am going to see
if I can cut these into rings to make a simple armillary sphere to
demonstrate these concepts.
Cheers,
Roger Bailey
Walking Shadow Designs
N 51 W 115
Today the solar declination is -22.3 degrees. At your latitude in Lisbon
(38.7) the altitude of the sun at noon is 90
of these for quite a while.
Cheers,
Roger Bailey
Walking Shadow Designs
N 51 W 115
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Romano, Judith
Sent: January 8, 2002 5:22 AM
To: 'sundial@rrz.uni-koeln.de'
Cc: John Hoy (E-mail)
Subject: Garden/Human Sundial
about 5 degrees. We are working at
corrections for this.
My conclusion is that the simple addition of these markers to the design of
analemmatic dials adds a lot to their function of demonstrating the cycles
of the sun with the seasons.
Roger Bailey
Walking Shadow Designs
N 51 W 115
-Original
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