An interesting question and more interesting history.
In J. L. Heilbron's book, The Sun in the Church, page 225 he describes
why the higher hole ( and lens) was placed. It seems it was more of a
way to get a larger midsummer image so that it was as good as the
midwinter one.
An interesting
Good point Kevin.
However, if you search on Tellurium you most likely will get the
element, Te and atomic number 52.
Wikipedia states that there are alternative spellings,
*tellurion*,//tellurian. I confess to using orrery as a generic term.
The Wikipedia on orrery states, "In 1764,
Interesting riff Kevin. It reminds me of an old B.C. cartoon where one
caveman is showing the other the sundial he has made and asks, Guess
what I have invented here? Then the other answers, A race of neurotics.
---
with a few dozen vanes.
- Claude Hartman
35N 120 W
On 4/23/2015 5:24 AM, Richard B. Langley wrote:
Came across this, this morning:
http://www.instructables.com/id/Time-oclock-shadow/
--Richard Langley
-
| Richard B
Gianni Ferrari's article, Copernicus And The First Reflection Sundial
appeared in the June 2004 edition of the Compendium in English.
On 4/6/2015 11:38 PM, Reinhold Kriegler wrote:
Copernicus reflecting dial
May I recommend Gianni Ferrari's splendid article:
Some readers have asked How can you make such a dial?
I would love to hear from an author of such dials to hear how it is done
in less than a year of marking points.
How did they do it?
Computer software certainly makes it easier. The popular Zonwvlak,
ZW2000, has long had a reflection
by the one built
there in 1999 and the fact that they have yearly sundial celebrations.
Please help me find others.
Claude Hartman
35N 120W
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
I am looking for photographs of reflecting dials other than ceiling
dials.The recent note about the village of
Aiello del Friuli has shown several. What other locations are there?
Contact off list if you wish. I hope to make a list of all known
examples and types.
Many thanks,
Claude
. 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
Correct me if I'm wrong, but I don't recall reading about this on this
list before.
An article from 2011, titled Is Rome’s Pantheon a Giant Sundial? is
shown at
http://www.history.com/news/is-romes-pantheon-a-giant-sundial
It quotes a book “Time in Antiquity,” by Hannahas saying
“In design
My son is a set dresser in Hollywood so I sent the statement of the
problem. Unfortunately he apparently had no reference to any prior
uses. Since he does not have the interest I have in sundials he gives a
perspective of the theatrical worker. Here was his reply:
Well, first of all, to
Interesting 10 and 12
Claude Hartman
On 5/2/2013 1:02 PM, Willy Leenders wrote:
The globe on the dome of
the Gustavianumin Uppsala
(Sweden)is a
sundial.
The shadow of the globe
on the globe itself indicates the time
of certain flowers??
Claude Hartman
35N 120W
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
. As pointed out by others, if they are polar
then we can expect a solar time keeping. Otherwise it gives a forest
of shadow casters that shorten in one point. An intriguing appearance.
Experiment!
There could well be many other examples of should we call it shadow
sculpture?
Claude Hartman
/zonnewijzers/en/zw-analem2-e.htm#principe
Op 23-apr-2011, om 21:24 heeft Claude Hartman het volgende geschreven:
I would like to question the instructional qualities of analemmatic
sundials.
Unlike Tony Moss' 'Multi-dial', it is my view that there is only one
relationship easily illustrated
A while ago mention was made of Holbein's 'The Ambasadors.' I ran
across this again on this site:
http://www.grand-illusions.com/opticalillusions/dinteville/
When I looked up the art of the artist István OroszI, I found he has a
sundial illusion called My Sun and Your Sun
Search for it on
I have an interest in sundials used in Beer advertisement. I made a
place-mat for an advertiser in 2000 for a limited circulation. (see below)
In trying to find more about the San Miguel ad I found an amusing Alan
Wake sundial at
Beautiful illustrations! Congratulations and thank you Tony
Claude Hartman
35N 120W
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
!
Claude Hartman
35N 120W
Tony Moss wrote:
John Carmichael wrote:
List member, Michael Harley, just showed me this other type of human
horizontal sundial (although the human is a statue):
http://www.blackrockvillage.ie/index.php?option=com_contentview=categoryid=92layout=blogItemid=78
See the work of Roger Berry :
http://rogerberry.info/Sculpture/SanMateo/san-mateo-shadow-04.html
Here he has a field of shafts at the angle of incident sunlight. He has
commented At any moment during the day one pole casts its shadow on
itself. At that time the shadows of the other poles
I want to make a desktop (or window) dial out of a solid block of acrylic.
Does anyone know of software which takes into account refraction into a
solid face that is NOT horizontal?
For example, a prism which has one face at the latitude angle and the
dial face horizontal on the bottom of the
Yes, indeed. I am trying to avoid inventing the special mathematical
calculations all over again!
Thanks for pulling these photos together as well as the wonderful site.
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
I sent this note to Frank King and forgot to copy to the list:
I know little about historical sundial use. However, it seems
quite accepted among cartoonists that a sun with RAYs close
to the horizon represents sun RISE.
I suppose the opposite, no rays, is sunset.
Something about the colors seem wrong! Can you really believe that they
changed the flesh tones to Grey??
Claude Hartman
mostly sunny 35N 120W
John Carmichael wrote:
HI Dialists:
I know most of you have seen photos of the magnificent multiple wall
dial at The Royal Palace of Wilanow
have an object of known dimensions in view. If angle
measurements are
to be made later, place an object in view with both X and Y dimensions
known (or at least
their ratio) or make both X and Y measurements somewhere. Paper money
is a good and
readily available object.
Claude Hartman
a vertical
down from the banner parallel to the bricks. That should put the
middle of the 12 and the noon mark more towards the center of
the brick. More like the 1 of the numeral 12.
Then there is the spacing of the hour marks . . .
Nice discovery!
Claude Hartman
see my skylight sundial, dial 18
I found more details of this indoor wall dial. Go to:
http://www.trenwyth.com/photo_gallery.asp?intPID=1startrec=73endrec=84
Image 82 of their Astra-Glaze photo gallery shows this to be located
at Little Village Academy, Chicago, Illinois. This kind of defeats our
guess at the latitude!
The
What an opportunity!
I would strongly suggest an *international contest.*
With so many to be done, you want a variety with the most unique ideas.
Look at the contest in Reutte, Austria in 1998. They picked a few sites
in their city and called for entries with the promise of a small prize.
This was a great story and presentation. However, it brings up the
difficulty of following such a presentation with just the visuals from
the PowerPoint presentation. What it needs is not only the speakers
notes as Roger mentions but perhaps the actual audio keyed to the
presentation.
Does
replaced.
See my hand-made awning for my patio on the stained glass site:
http://advanceassociates.com/Sundials/Stained_Glass/sundials_EGP.html
Dial 18, Hartman Skylight Dial
Claude Hartman
35N 120W
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
This reminds me of teaching solar water heating back in 1980. Part of
the problem was site selection. If you Google that phrase you can
still find articles on devices to use. The most expensive is the $255
Solar Pathfinder. Compare that to the Solar Site Selector at $30 or
make your own.
questions
about what their shadow does.
Just thinking outside my box -
Claude Hartman
120W 35N
-
), the on featured on the home
page of De Zonnewijzerkring, the oldest
dated public sundial in The Netherlands, on
Jacobi Church in Utrecht.
Perhaps some may be interested in listing here
other examples.
Claude Hartman
35N 120W
Attachment converted: Macintosh HD:gothic clock face.jpg (JPEG/«IC
error it
may have
accumulated.
Considering the difficulty I had with a client
using clock
time I would favor having a client that used Zarbula's
method at several times during a day. The
problem would
be the man hours required.
Claude Hartman
Arroyo Grande, CA
35N 120W
Attachment converted
! (sundials and cameras)
Claude Hartman
Arroyo Grande
35N 120W
-
and interesting for young students.
Claude Hartman
-
- the true 'stained glass'.
Claude Hartman
35N 120W
tony moss wrote:
Fellow Shadow Watchers,
About 12 years ago I built an extension to my
workshop which, from the outside, looks like a garden conservatory. To
avoid overlooking my neighbour's garden and to reinforce
. This will give
much straighter line than those done by hand.
Claude Hartman
35N 120W
-
of the first
example.
However, he has some discussion of the Melbourne
application on page 288.
By the way, an excellent guide to this book is found on
www.math.nus.edu.sg/aslaksen/teaching/heilbron.html
Claude Hartman
Arroyo Grande, CA
35.13N 120.58W
Tom Egan wrote:
I'm looking for examples of dials
on this list.
Claude Hartman
35N 120W
-
it is equatorial, it seems to me that the design could be
modified with a sliding scale for EOT and longitude adjustments.
Claude Hartman
[EMAIL PROTECTED] wrote:
The cone of the dial is facing upwards, because that is the way Mr.
Schmoyer's daughter took the picture. She is not a sundialist, and did
You have done a spectacular job. I especially like
your comments. They are very informative and useful
to someone interested in making sundials.
Claude Hartman
35N 120W
Frans W. Maes wrote:
Dear sundial friends,
Some two years ago I published a website in Dutch about the unique Sundial
I had not noticed before how wide the European time zone was, plus being
based
on 15E.
The summer time marking makes sense because a huge line of trees probably
shades the dial most of the time in the winter.
Too bad. I was hoping for something more interesting.
Claude
35N 120W - land
or tubes
for each hour. Certainly an optical dial (panorama or fish eye view of
the sky) would be
interesting but much more complicated and expensive with the number of
field lens needed
down such a long tube.
Claude Hartman
Sunlight Designs
120 W 35 N
-
Many thanks Frans for pointing out that these articles were posted. I
will make a point of mentioning them in my column.
Thanks also to everyone who has given this question some thought.
Claude Hartman
Frans W. Maes wrote:
- Original Message -
From: Claude Hartman [EMAIL PROTECTED
.
Is there a collection of those CLOCKS magazine articles?
Claude Hartman
Arroyo Grande, CA
Frans W. Maes wrote:
Hi Claude,
Why choosing technology of the previous century? Why not moving one more
step ahead and taking the spreadsheet approach? The ease of making the
necessary serial
for my Back to
Basics column in the NASS Compendium.
Claude Hartman
-
What a nice feature! It is nice to browse through such a variety.
Claude Hartman
Robert Terwilliger wrote:
A photo index has been added to The NASS Register of North American
Sundials. Now you can browse all 274 photos in the register on
thumbnail pages. Each thumbnail links to the full
Many thanks to John and Dave for such a splendid piece of work!!
Claude Hartman
-
on some walls they have either not survived or have not
been recognized as such.
Claude Hartman
Arroyo Grande, California
[EMAIL PROTECTED] wrote:
Dear Colleagues,
A Californian diallist who is not a member of this list wants to put a
vertical sundial on a local church building, now used
or whatever.
Just another thought!
Claude Hartman
Sunlight Designs
Edley McKnight wrote:
Hi John,
Although it sounds intriguing, fabrics/rugs stretch/shrink quite a bit, so
I don't know how accurate this would be. Then again, if there are
many people present, the sun spot might not actually reach
Nice Job! A very useful combination of EOT and clock.
Claude Hartman
35.13N 120.58W
[EMAIL PROTECTED] wrote:
I just finished writing a tidy little program that calculates when the sun is
exactly south (or north), east and west for any given date and location. I
wrote it to help mark
. The ones on the North
side
would be illuminated at certain times. This too was not built as shown because
the
architects had their own idea about the shape of the gnomon.
Claude Hartman
35.13N 120.58W
[EMAIL PROTECTED] wrote:
If you follow a link which is still operational on the page found
US patent by Keatch, or other sundials that are slotted. However, it only
admits one time, not several.
Does anyone know of references or examples of something similar?
Claude Hartman
120.58W 35.13N
-
it such a success.
This kind soul and personable being will be sorely missed.
With much sadness,
Claude Hartman
-
this at several intervals at least hours apart and at different
locations along the wall.
When they return everything you have the shadows you can measure. You
can also check the time on the digital watch.
Claude Hartman
35.13 N 120.58 W
Even with the best of
-
.
Claude Hartman
34 N 120 W
J. Tallman wrote:
Hello All,
I am taking some documentary photographs of a new sundial concept and
I need a little help.
I recall reading several postings in the past that referred to using a
point light source to simulate the sun. This would be very helpful
affect the goodwill or
well being of any of our members. Certainly I would
not want to see the
congenial atmosphere of this list changed in any way.
My thanks to all for the words of comfort and concern.
Claude Hartman
Frank Evans wrote:
Greetings, fellow dialists,
At this time of great grief
and openess of
communication rather than the darkness of panic or
despair.
Claude Hartman
still in California, unable to reach the NASS
conference in Montreal
. He has produced a very richly
illustrated site with valuable references.
Claude Hartman
35N 120W
this very much a
historical question. Is it true that US Naval midshipmen no longer
study use of the sextant? You can only hope that the GPS or radio in
your lifeboat has good batteries.
Claude Hartman
conference in San
Francisco?
Thanks
John C.
Only the dates have been set: Aug.
18-20, 2000 in San Francisco.
Other details are being worked on.
Claude Hartman
NASS vp
is turned to align with the sun to get true north.
Is this device still used?
Military surplus seems the best place to look. However, some scientific
educational supply houses may have similar items of about the same accuracy.
Claude Hartman
Arroyo Grande, CA
35N 120W
Al Schoepp wrote:
I
This was announced in October on this list by Mark Gingrich.
Although it deals with the use of cathedral meridiana it goes much further in
summarizing the history of astronomy leading to the calendar reform and the
involvement of the church. Very thoroughly referenced. I was delighted to read
Ken -
Sundials at train stations follows a
well established tradition.
Rene Rohr mentions It is not generally
known that this instrument was used
into the twentieth century by some
networks of the French railways for
uniformity in the setting of the station
clocks. (end of chapter one)
Solar
! In order to catch it crossing
the meridian earlier in the evening will
require watching Sunday or Monday.
Claude Hartman
35N 120W
As far as I know there are no church
meridians this far west!
has great
power in these matters, has specifically
said that it gives a sealed envelope
little evidentiary value.
Claude Hartman
35.13N 120.58W
While browsing through a book on stained glass I found a reference to sundials
on stained glass. It was mentioned that this was done extensively in England
for church windows. Does anyone know of existing examples?
Rohr (Sundials: history , theory and practice. Dover Publications) pictures on
with
colored terrazzo filling the spaces.
Claude Hartman
Sunlight Designs
I received the following request. If anyone has the information, please
post it and I will pass it on to the one who asked.
-- original request: --
I am an architect from Boston Massachusetts.
Our firm is doing research for a project in Kuwait
I came across your web site while
I recently was asked the following question:
Are you aware of any software or organization able to plot analemmatic
sundial positions?
Does anyone have an answer?
Happy Holidays to all!
Claude Hartman
[EMAIL PROTECTED]
Mac Oglesby wrote me a correction on my comment for practical use of a
sundial on the moon in which I mistakenly got enthused about using
Babylonian hours:
(snip)
Quoting from the Dialist's Companion, Babylonian and Italian
hours are from two of the earliest systems of recording time to
for 195F plus postage of about 32F. Credit card orders
are taken.
The address is CNRS Editions, 20/22 rue Saint Amand, 75015 Paris,
France.
Claude Hartman
Los Alamitos, CA
I believe someone posted a note about the re-printing of the book on
Sundials in Paris. I have lost this note.
Please, could someone repeat it for me?
Claude Hartman
Los Alamitos, CA
I will be visiting my son in Koln the first two weeks in July. We are
planning trips to Amsterdam and Paris.
Are there some good sundial sites I could visit? Are there locations
where I could find English language books or a collection of the Journal
of the British Sundial Society?
I am
I am searching for references to REFLECTION SUNDIALS that do more than
just project a spot on the wall or ceiling.
Daniel Roth has given me one example: The Gallery of the Astrolabe in
Rome.
I have copies of many related U.S. patents up through 1993. I have not
searched any foreign patents.
If
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