Re: Old Egyptian sundials

to the Schmoyer Sunquest. Unmachined casting sets are also available for do-it-yourselfers. One Bronze Sunquest that should be available for public viewing this spring is being delivered to the Perkins Observatory in Delaware, Ohio. Bill Gottesman

Re: South Vertical Declining dial

misaligned your dial or wall is using www.precisionsundials.com/sundialalign.exe . It works best near the solstices, so next month would be the ideal time to try it out. Bill Gottesman www.precisionsundials.com - Original Message - From: [EMAIL PROTECTED] To: sundial@uni-koeln.de Cc

A fast Sundial (apologies if this is a duplicate mailing)

I recently built this fast sundial. I think you will get a kick out of it. View it on this private web-page for sundial list readers: www.precisionsundials.com/sundial_list.htm -Bill Gottesman--- https://lists.uni-koeln.de/mailman/listinfo

Re: A very interesting dial

Fascinating. Does anyone know it the analemmas were placed after observing the movement of the sun, or before? i.e., how was it done? And, is there a focusing lens involved? And if so, how do they dealt with focusing it over such a variable distance? -Bill G. - Original Message -

Re: Non-terrestrial sundials

What a hoot. Thanks for putting those photos on the internet. It works like a ring dial on steroids. Very cool. -Bill G. - Original Message - From: fer de vries [EMAIL PROTECTED] To: J. Tallman [EMAIL PROTECTED]; Sundial List [EMAIL PROTECTED] Sent: Sunday, October 14, 2007 11:11

Re: Mystery object

According to www.campbellsci.ca/Museum_Radiation_1_F.html , it is a Campbell-Stokes sunshine recorder. Apparantly, it is still in use, and still available. -Bill - Original Message - From: Dave Bell [EMAIL PROTECTED] To: Frederick Jaggi [EMAIL PROTECTED] Cc: Sundial Sundial List

Re: Mystery object in 3-D

I stumbled across a cool 3-D view of a campbell stokes recorder here: http://www.ems.psu.edu/~fraser/qtvr/ssr.html You have to permit the Active-X control to view it -Bill G. --- https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Does Refraction Affect Azimuth? / Re: sundial Digest, Vol 24, Issue 17

of Nutation. I'm not so sure about the other topics you mention. I would guess parallax of the sun from the perspective of the earth's diameter is covered in surveying books, or perhaps one of the astronomical trigonometry books by Smart. -Bill Gottesman - Original Message - From

Re: Does Refraction Affect Azimuth? / Re: sundial Digest, Vol 24, Issue 17

- From: Warren Thom To: Bill Gottesman ; Mashallah Ali-Ahyaie ; sundial@uni-koeln.de Sent: Thursday, December 27, 2007 12:47 PM Subject: Re: Does Refraction Affect Azimuth? / Re: sundial Digest, Vol 24,Issue 17 Hi Bill, If I recall your comments at the NASS meeting correctly

Re: Advice wanted, on 'Analemmatic' sundial orientation

Nice job. Original, adaptable. I suspect it can be modified to apply to a larger scope of dials than just analemmatic. Not sure the public would go for it aesthetically, but I admire the concept. -Bill Gottesman John Lynes wrote: I'm grateful for the generous reception you gave to my last

Re: How to engrave marble?

. He glues the design right against the stone, and cuts right through the paper (or vellum?). He has a hose trickle water over the cutting surface to cut down on dust and prolong tool life. His website is www.sundialsculptures.com Bill Gottesman www.precisionsundials.com Ricardo Cernic wrote

Re: Earth eccentricity

then recent confinement for publicly expressing the same opinion. The irony is that the very same meridian line that was built to support church doctrine (Easter) was found to disprove other church doctrine (Ptolemaic solar system). -Bill Gottesman Jos Kint wrote: Hello all, I am looking

Rapid Prototyping for sundial parts

businesses design 3-D models, and allows you to export them in a file format suitable for rapid prototyping? -Bill Gottesman --- https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Rapid Prototyping for sundial parts

for rapid prototyping? -Bill Gottesman --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Preventing Rod Gnomon Bending

Dangerous territory for me; I am not an engineer. That said, see attached pdf. Could a cable or rod strung internally in the hollow pole/gnomon be placed under tension, causing the pole to bow upwards against gravity? The rod or cable could have a turnbuckle to make the tension adjustable,

YouTube videos

Hello list members, I recently placed all (5) of my sundial related videos on YouTube, which makes them more easily accessible and compatible with different computers. Some of you have seen them before. They can be accessed either by typing precision sundials into the YouTube search box, or

Re: Info on a new sundial

It looks like it may have been a freebie (langiappe) given at a French sundial society meeting. Fun sundial! This is a model of what was a fairly common type of portable sundial about 200 years ago, but I don't recall the name. Suspend the dial from a string tied around the elongated slot and

Re: Off topic but I thinkyou'll enjoy this.

Hi Tony, My wife and I were Susan-Struck about 2 days ago. We have watched it so many times that of the 20 million You-Tube hits, my wife and I are probably responsible for about 2 million of them. If you are British, then you must be able to sing like that too. I think you owe a

Re: Translations

I, too would like to see the math.  I would love to try and work this out, but I don't have the time at present, and I'm not sure I am up to the task anyway.  I can imagine that it may involve an "envelope" of line intersections, much the same way an astroid is a curve drawn from intersections

Re: Fwd: Direct reading time.

I like it.  I would like to hear the story of how it was designed and fabricated.  Is it located at a residence or a public place? -Bill Gottesman Burlington, VT Robert Bargalló wrote: -- Forwarded message -- From: Robert Bargalló bargallorob...@gmail.com Date: 2009/9

Re: Another mechanical sundial

Fer, Does the arm articulate to show declination? In other words, does the arrow point to the sun exactly, or just the meridian line where the sun is? Declination on March 12 is about 3 degrees south, but the arrow looks to be pointing fairly deeply into to the southern celestial

Re: Another Human Gnomon ... Vertical in Bruz (France)

Clever and original.  Thank you for sharing it.  It is so interesting that in 2009, people are still creating new and innovative designs for something as old as sundials.  There is no reason this design could not have been conceived 400 years ago, but it wasn't! -Bill Gottesman robic.joel

Re: Nasa website

According to calculations in Meeus' book, 2009 Solstice is on 12/21 at 12:47:50 PM Eastern Standard Time. This is supposed to be within 1 minute of VSOP87 theory. -Bill Gottesman PATRICK O'HEARN wrote: Hello All, May I recommend to everyone today's (12/20/09) astronomy picture of the day

Re: zodiac lengths

Well done, Frank! -Bill Gottesman Frank King wrote: Dear Thomas, You ask interesting questions and the answers depend slightly on just how precisely you want the model the way the sun goes round the ecliptic. QUESTION 1 ... do [Gemini and Cancer] share *exactly* the same region

Re: 3d sundial-model?

on the rotary table. This is a mechanical old-school approach. Later I found many uses for the rotary table when machining parts on my (small) milling machine. If you attend this year's NASS conference August 12-15, I will show my modest basement workshop on the tour. -Bill Gottesman Thomas Steiner

Re: Porter. Hartness. What's the difference?

FYI: Bert Willard, curator of the Springfield Telescope Maker's museum in Springfield, Vermont has indicated that he will bring both that very same James Hartness dial, and a Russel Porter mystery dial, to the NASS convention this August in Burlington, Vermont. -Bill Gottesman LJ Coletti

Re: Russell Porter Sundial?

I think the dial could be called a Polar dial, but I favor Equatorial, because the hour marks will be evenly spaced along a cylindrical surface, typical of many equatorial dials.  How about shaking things up a bit, and calling it a Polar Equatorial?  Definitely not horizontal. -Bill Gottesman

Re: My New Sundials

Thank you for sharing these. I especially like the coloring and layout of the KOA Campground dial. -Bill John Carmichael wrote: I have made a new 32 stone sundial that will soon be installed at Yanney Heritage Park in Kearney Nebraska. I just thought youd like to see it

Re: Stainless Steel Spheres

general cone gnomon. Fabio Savian has created some wonderful dials along the same principles. In these dial the shadow of the sphere does all the work, so it makes no difference whether or not the sphere is reflective. -Bill Gottesman Mike Cowham wrote: Dear Dialling Friends, I have

NASS 2010: Any Photos of University of Vermont Physics Dept presentation?

Hello All, If anyone has photos of the presentation at the Univerity of Vermont Physics Dept from the NASS 2010 bus tour, please send them to me at billgottes...@comcast.net (or to Dave Hammond - see email above). I don't think you can send them via this mailing list. Dave Hammond said we

Re: A new look at the Equation of Time

Very nice Kevin. Thank you sharing this. -Bill On 9/28/2010 9:05 AM, Kevin Karney wrote: Dear Colleagues You may be interested in the attached chart of the Equation of Time for 2011. It is of interest for a number of reasons... - it

Sad news for the Sundial Community

I learned from JD Gard's website for the ATEN sundials that David (Gard?), the inventor of the Aten heliochronometer, has died. I do not know if the company will still sell the sundial. I own one of the models, and it is a favorite to show guests. It is readable to better than 1 minute. I

Mechanically Complex Solar Compass on sale at auction

I saw (on-line) this interesting sun compass for sale by auction this coming November 20th. I have not seen anything like it. Other scientific instruments, clocks, sundials for sale at same auction. I doubt I will bid on it. -Bill

Re: Burt Astronomical Compass (was Mechanically Complex Solar Compass on sale at auction)

pring gone? - Original Message - From: Bill Gottesman To: Sundial Mailing List Sent: Thursday, November 04, 2010 1:04 PM Subject: Mechanically Complex Solar Compass on sale at auction

Re: What can be calculated with a sun dial?

A few extra: The stereographic projection, as used by Oughtred, allows calculation of the sun's altitude and azimuth at any (day)time on any date, and conversely, the calculation for which date and time the sun is at a specific azimuth and altitude. The

Re: stop the earth: TI 59 PPX; No No Nooooooo!

Roger, Roger, Roger, Say it isn't so. I had you figured as an HP 65 or HP 67 kind of guy. -Bill On 12/11/2010 1:53 PM, Roger Bailey wrote: Hi Brent, I found my old TI 59 PPX program to calculate the look up angle. To have a look at the math and the program steps go to this personal

Re: stop the earth: TI 59 PPX; No No Nooooooo!

Summer solstice! You lucky dog. -Bill On 12/13/2010 5:35 PM, John Pickard wrote: Gee, I'm starting to sound like a grumpy old man. It must be the upcoming summer solstice. --- https://lists.uni-koeln.de/mailman/listinfo/sundial

Wonderful NREL Sun Position Calculator, in time for Solstice fun

Hello Sundial-listers, I used to rely on Luke Coletti's Great Circle website's GROK calculator for a precise calculation of sun positions, but that page has been non-operative for about a year now. The National Renewable Energy Laboratory (NREL) in Golden

Re: Puzzle Photograph of the Eclipse - A complete guess

This is just a conjecture: I do not think this focused image of the eclipsed sun is a pin-hole artifact. My guess is that it is a focused image by the lens, but is a 2nd or 3rd internal lens relfection. In this manner, the image might be reversed, and its brightness greatly attenuated, so

Re: altitude dial

That is a very impressive both mathematically, and as an original dial. -Bill On 1/25/2011 12:01 PM, Fabio Savian wrote: hi Frank, two years ago I designed a variant of the shepherd's dial so it became universal (for any latitude).

A 14th century sundial question from France.

Richard Kremer, the Dartmouth physics professor who brought the ~1773 Dartmouth Sundial to display at the NASS convention this past summer, asked me the following question. I have done a bit of modelling on it, and have not been able to supply a satisfactory answer. Is anyone interested in

Re: Moscow sundial?

That is Hilarious! Maybe for nickle it can read your fortune, too! -Bill Gottesman On 3/11/2011 4:56 PM, Willy Leenders wrote: Maybe this helps: a bathroom weighting scale on a rail along the midline and the instruction on the scale, slide the scale until the date and read your weight

Re: BSS Bulletin on DVD

Sign me up, John! How do we pay? Can we use paypal? -Bill G On 3/11/2011 11:17 AM, JOHN DAVIS wrote: Dear Dialling Colleagues, The British Sundial Society is pleased to announce

Re: Asking for advice, on starting-up a sundial business

. There is no mistaking a Spectra sundial, a Wenger sundial, or one of John Carmichael's carved stone dials, for example. Though those are all examples of custom dials, I am sure even if your product is a massed produced one, you can still make it look like an Andersson dial. -Bill Gottesman Precision

Re: Multignomon Sundial

Fabio, these are really wonderful ideas. I would not have understood your block dial idea if I had not learned about shadowplane dials fom Mac Oglesby and, I believe, Fer de Vries. -Bill On 6/13/2011 8:31 AM, Fabio Savian wrote: ...

Re: E o T diagram

I do not know the answer to this question: Looking at the intersections of the EoT and Mean Time curves in M. Garcia's diagram, is there any reason to conclude that the area of the intersections outside the mean time curve must equal the area of the intersections inside the mean time curve?

Re: Azimuth calculation/Wall declination

About 10 years ago I worked out a simple method to measure wall declination using just a carpenter's square and an accurate watch.  The methods is described here http://www.precisionsundials.com/wall%20declination.pdf, and a simple windows program that does all the

Falling Tree

I think quantum physicists Neils Bohr and Erwin Schrodinger would say there is no sound until it is observed. But I don't understand this stuff all too well. -Bill On 8/10/2011 7:26 PM, Donald Christensen wrote: If a tree falls in the forest where no one can hear it, does it make a sound?

Re: Fwd: Re: Question on a possible sundial.

I agree that it is not likely to be a sundial.  I wonder what markings are hidden under the flower bowl.  For example, this could be an anniversary sundial, marking solar noon with a light beam on a particular date.  Or maybe it is a type of compass aligned with the

Re: Earth rotations

I think it is 366.25 rotations. The orbit around the sun accounts for one additional axis rotation to the 365.25 day-to-day rotations. Yes? No? -Bill G On 9/30/2011 11:41 AM, Marcelo wrote: I think it's a little, a very little less than 365,25 rotations.

Re: Bulgarian Sundial Design

I have not seen this design before. I like it and I think the public will too. I think it would be useful. -Bill On 11/16/2011 3:46 AM, Mike Cowham wrote: Dear Sundial Friends, I have been in contact with a man, Boris Kostov,in Bulgaria

Re: Bulgarian Sundial Design

I meant to add: How to handle the rapid change in EoT around the solstices will be challenging. -Bill On 11/16/2011 3:46 AM, Mike Cowham wrote: Dear Sundial Friends, I have been in contact with a man, Boris Kostov,in Bulgaria

Re: paper sundial

Fabio, these paper dials are wonderful! What a great treat. Thank you so much. -Bill Gottesman On Thu, Dec 15, 2011 at 6:09 AM, Fabio nonvedolora fabio.sav...@nonvedolora.it wrote: Hi all, news from the clouds. I’ve a toy for the end of the year. I don’t think this is the very last end

Re: Christmas Greetings

Very nice. -Bill Gottesman On Fri, Dec 16, 2011 at 7:57 AM, Kevin Karney ke...@karney.com wrote: Dear Fellow Gnonomists The comes with greetings from Elizabeth and myself for a very blessed Christmas and a wish for the sunniest of days in 2012. The attachment is an intrinsic

Re: Sundials in cinema

The dial and the trees show two shadows from different light sources. Would it give too much away to explain why that is? -Bill On Sun, Dec 18, 2011 at 5:36 PM, Darek Oczki dhar...@o2.pl wrote: Dear friends I've got two news for those interested in sundials in movies. 1. In the very

Re: How would this sundial work?

There is more of a description of that dial at http://www.diduknow.info/sun/san6.html#. It is a horizontal dial of which the gnomon has been broken off. It is for use during daytime and at night. I presume the rotating plate allows adjustment for telling time by the moon, depending where the

Re: Cray Research 1984 Sun Dial

I own one, from ebay. It is unique in that the numerals are in binary. There are many chinese characters on the dial face, but I do not know what they mean. I have photos if any one wants a stab at deciphering them. -Bill On 4/26/2012 2:26 PM, J M wrote: A friend

Re: Analemmatic in a public place

Very nice. -Bill On Tue, May 15, 2012 at 4:15 PM, Mac Oglesby ogle...@sover.net wrote: Hello friends, Last Saturday I repainted the analemmatic sundial I installed a few years ago outside the west entrance to my town's Municipal Center. You can see the lower parts of the doors in the

Re: Transit of Venus

Sara, 1) That is pretty original. 2) It won't be copied by anyone in our lifetime. -Bill Ken Launie, proposed to me between first and second contact of Venus on the Sun as we shared an eyepiece ---

Re: New analemmatic

What does the writing along the top and bottom of the dial say in english? -Bill On Sat, Jun 16, 2012 at 4:26 AM, Perit Alexei Pace a...@onvol.net wrote: Dear all, An analemmatic sundial (humbly designed by the undersigned) has now been completed in the village of l-Għarb in Gozo (Malta).

Shadow Clock Kit

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 ---

Re: Shadow Clock Kit

I am so ashamed. -Bill On Wed, Jun 20, 2012 at 5:17 PM, Fred Sawyer fwsaw...@gmail.com wrote: 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.net

Re: The most exact sundial of the world In Samedan!

. -Bill Gottesman On 6/25/2012 3:55 PM, Frans W. Maes wrote: Dear Fabio, Roger all, It is always interesting and instructive to consider claims of extraordinary properties; in this case, a temporal accuracy of 10 seconds

Re: Sundial found in Jamestown excavation

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

DeltaCad on a mac

Hello Listers, The delta cad website now says DeltaCad will run on the Mac operating system. Has anyone tried it out? -Bill --- https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: St. Margareth

Thank you for sharing this dial. It is a great example of the quiet strength of simple design elements. The blue background with white lines and numbers is friendly to the eye and eye-catching at the same time. The symmetry of the annular dials surrounding the round stain glass windows is very

Re: Wall declination

. -Bill Gottesman On Sat, Sep 22, 2012 at 7:36 AM, Charles Beck chforens...@gmail.com wrote: Hello all, My first post here, another sundial enthusiast. Doing my first sundial on a declining westerly wall. Can you share your tips to measure the wall's declination as accurately as possible

Re: Hurray of Oz !

That is incredible Fabio. How did you figure this out? -Bill On Wed, Jan 23, 2013 at 10:07 AM, Fabio nonvedolora fabio.sav...@nonvedolora.it wrote: Hi Kevin, the name is just right, I think to know what it was connected to: http://youtu.be/cwofR3J0Gh4 ciao Fabio Fabio Savian

Re: NASS Conference

Yay!. -Bill On Wed, Jan 23, 2013 at 2:23 PM, Fred Sawyer fwsaw...@gmail.com wrote: 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

Re: equation of time sundial

Hello All, I think Mike nailed it, as to what Ken is asking. I know of no sundial, other than Mike's here, that directly measures the Eot, rather than somehow incorporate the EoT calculated elsewhere. I did not think this was possible until I saw Mike's solution just now, because a sundial has

Re: Sundials of castel parks

There is a magnificent public sundial in Australia, seen as a spiral town square on Google Earth at lat -37.802467, longitude 144.965927 degrees. It is flat to the ground, but unlike an analemmatic, it uses the person's height to tell time, and looks more like a traditional horizontal layout.

Re: A prize for the worst dial of the year?

OK, that one is a contender. -Bill On Fri, Apr 5, 2013 at 1:21 PM, brianalbinson brianalbin...@shaw.ca wrote: Bob Try this one. Solid bronze from the local hardware store. Brian On 4/4/2013 5:33 PM, Robert Terwilliger wrote: Here’s one ** ** In my

Re: person's height sundial

Very nice dial. For it to be a person's height dial, don't you need to show where people of different heights must stand? These heights are marked on the Argyle Square dial in Australia (at least, I think they are). You have some nice photos on your web site of dials I have never seen before.

Re: Art in dialling

Hello Fabio, Marvelous public sundial! How did you construct the concrete bowl, and mark the lines so straight? I imagine it has a drain for water. -Bill On Sun, Apr 7, 2013 at 12:14 PM, f...@solariameridiane.it f...@solariameridiane.it wrote: Hi all this is my work in 2006, created for

Re: Alt Augsburg revisited

I will start a guess. I think the Hour hand below the gnomon was to be set manually by the user to align with the shadow line from the gnomon. This hand was mechanically linked to the central clock dial minute hand, to show minutes past the hour. In this manner, a user would use the sundial to

Re: Advice please: Good outdoor surface for painting an analemmatic dial

I used a paint for concrete on asphalt for an analemmatic about 13 years ago. It held up for a few years at least, but then the school repaved the area. -Bill G. On Thu, May 2, 2013 at 3:37 PM, Tom Kreyche tkrey...@well.com wrote: Search on Tennis Court Paint and you will get all kinds of

Ragtime/Jazz sundial lyric

Hello Sundial-Listers, By happenstance I found a piano roll video performance of Lu-Lu-Lou (1920's?). One of the verses ends with: Lu Lu she's so dumb she'll soon be in the booby hatch I saw her telling time last night on a sundial with a match. I don't really recommend the performance, but it

08:09:10 11/12/13

Did anyone catch this auspicious moment, 08:09:10 11/12/13? I missed it, but will go for another try this PM. -Bill --- https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Aussie hours til sunset dial

Great Story, Jim. Mac Oglesby has been a strong proponent of Hours to Sunset dials for years. This one is magnificent, thanks for sharing it. -Bill On Tue, Nov 19, 2013 at 4:17 PM, J. Tallman jtall...@artisanindustrials.com wrote: Hello All, I got a link today from a Spectra owner

Re: Calculating the Equation of Time and other Solar Parameters

Kevin, I am excited about your article Basic Astronomy for the Gnomonist. It will take some time to digest, but it seems to have a very nice graphic analysis for the many formulas and solar positioning we deal with. I appreciate you making this reference available. I think what you call a

Re: Most accurate Sundial in the World

That is pretty bold claim, one which I do not make with my own dials. This dial is designed to be readable to 5 seconds, but accuracy could be another matter. There are so many variables that affect accuracy, and some are easily overlooked. Specifically, critical alignment with the north

Re: Sun tracks

Here is what I think: The can is laying on its side with its axis oriented north-south. A pinhole is made on the west side of the can (assuming this location is in the northern hemisphere, and that the zenith of the sun is toward the south), pointing upward at about 45 degrees. It captures the

Re: The Bill Gottesman stance

I say we tack on as many names as possible. Roger Bailey told me a few years ago he reported on this stance independently. -Bill On Sat, May 10, 2014 at 3:40 PM, Robert Terwilliger b...@twigsdigs.comwrote: I have always been of the opinion that the optimal stance to assume as the gnomon of

Re: Using the moon to find south [SEC=UNOFFICIAL]

Thanks, Hank. Very helpful observations. The ecliptic north pole lies in the curve of Draco's (The Serpent) neck. From your explanation, it seems that the line connecting the crescents of the moon should always point approximately to that location, and this should be something easy to test in

Re: paperhenge

Paper henge is totally awesome. -Bill On Wed, Jun 4, 2014 at 7:08 AM, Fabio nonvedolora fabio.sav...@nonvedolora.it wrote: Hi all on sunday there was the ‘Festa delle Meridiane’ (sundial feast) in Aiello, a village in the NorthEast of Italy where there are 104 sundials and 2252

Re: CORRECTIONS Extensions to A few new Tables for the Gnomonist...

Well, you could include both ways. This is a really nice resource you have provided. Did you already say the reference for your high precision calculations? -Bill On Thu, Jun 12, 2014 at 1:12 PM, Kevin Karney kar...@me.com wrote: Dear Friends Thanks for the positive comments! And thanks

Re: summer house / sundial

Very cute!. If the room rotated to follow the sun's azimuth daily, the heart would be present much of the day, and would lengthen towards mid-day. -Bill On Thu, Jan 1, 2015 at 2:00 PM, Willy Leenders willy.leend...@telenet.be wrote: I designed a romantic summer house / sundial and I like to

Re: A question for the mathematically inclined

You can download a free excel spreadsheet, sunpositioncalculator at http://precisionsundials.com/sunpositioncalculator.xls. The Azimuth page allows you to input date, latitude, longitude, and azimuth, and it gives you the civil time, eot, declination, and altitude. When opening, you must allow

Re: Clouding the issue

That is an excellent question! I have seen this photo before, and never noticed the numbers running twice in a semicircle. I, too, am perplexed. I read about this dial in Hester Higton's book Sundials at Greenwich. The dial operates on two successive polarizations of light - the first being

Re: A Digital Sundial on Instructables

Brilliant. First dial I've seen like that. Thanks for sharing -Bill On Thu, Apr 23, 2015 at 8:24 AM, Richard B. Langley l...@unb.ca wrote: Came across this, this morning: http://www.instructables.com/id/Time-oclock-shadow/ --Richard Langley

Re: Die Grieskirchner Kepleruhr

Awesome dial. I have never seen a gapped nodus like that before, not have I seen the use of mirrors to project an image for when the sun is behind the wall. Please tell us who designed this dial, and how it was commissioned? I could not find that information in the article. I work with mirror

Re: NASS site down?

..@uni-koeln.de] *On Behalf Of *Bill > Gottesman > *Sent:* Saturday, October 31, 2015 8:07 PM > *To:* Sundials List <sundial@uni-koeln.de> > *Subject:* NASS site down? > > > > Sundials.org is unavailable tonight. Anyone aware of a problem? > > > > -Bill Got

Re: 3D digital sundial

Very cool. Has anyone had a chance to try the free 3D software OpenScad? By the way, I am skeptical that the sundial can handle declinations near the solstices. -Bill On Fri, Nov 6, 2015 at 7:39 AM, Darek Oczki wrote: > Hello everyone > > Have you seen this 3D digital sundial? >

NASS site down?

Sundials.org is unavailable tonight. Anyone aware of a problem? -Bill Gottesman --- https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: due east photos

Well, if you are going to allow compass directions, then that opens the door to all loxodromes. There are an infnite number of loxodromes that connect two points on a sphere, if you allow loxodrome paths that travel more than once around the globe! This gives an infinite number of compass

Re: A Happy Leap Year Day to everyone

Thank you Frank! What a fun thing to know! -Bill On Wed, Feb 24, 2016 at 3:11 AM, 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

Re: Enquiry relating to the wide polar gnomon and its midnight overlap in polar area

Why is the Longyearbyen sundial irrelevant to your project? - Bill On Friday, July 22, 2016, Helmut Haase wrote: > Hi all, > When studying the wide polar gnomon one inevitably encounters edge changes > to be respected. My special focus is on a horizontal dial for a

Re: Astronomy Picture of the Day (Again)

That was awesome, Bob. -Bill On Wed, Dec 21, 2016 at 8:43 AM, Robert Terwilliger wrote: > This is a good one! > > > > Traces of the Sun > > http://apod.nasa.gov/apod/ap161221.html > > > > Bob > > > > --- >

Re: Kepler

Lord knows how you came up with this. -Bill On Fri, Jul 7, 2017 at 5:46 AM, fabio.sav...@nonvedolora.it < fabio.sav...@nonvedolora.it> wrote: > Hi, I just finished a work that has engaged me in the last two weeks. > > For those are interested about the Kepler's laws, it > > --- > New Outlook

S-Town, John B McLemore

Hello Sundial Listers, I was wondering if anyone of us knew John B Mclemore, the Horologist protagonist of the This American Life radio show S-Town. The story includes his fascination with sundials and astrolabes. Was he known to any of us? -Bill

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