Re: What can be calculated with a sun dial?
Some new items (all in already built sundials): - The seasonal or temporary hours - The canonical time - The sideral time - The instant when a given star or constellation transits - The planetary hours - The beginning of the Zodiacal signs - The day of an important date (f.e. birthday, wedding anniversary, etc.) - The time in different cities in the world - The school timetable - The hours of light, that is to the Civil Twilight - The hours to the Astronomical Twilight - The time of the Islamic Prayer Zuhr (noon prayer) - The time of the Islamic Prayer ‘Asr (afternoon prayer) - The time of the Islamic Prayer Maghrib (sunset prayer) - The time of the Islamic Prayer Isha’ (night prayer, at the end of the astronomical twilight) - The direction of Mecca, that is the Islamic kibla Best wishes Gianni Ferrari 2010/11/16 Jos Kint jos.k...@skynet.be Dear sun dialists, What can be calculated with a good sun dial? Here is a list of 19 topics. Can you add some more items? 1. The hour of the day 2. The day of the year. 3. The solar altitude. 4. The solar azimuth. 5. The longitude of the sun dial. 6. The latitude of the sun dial. 7. The moment of the equinoxes 8. The moment of the solstices. 9. The length of the tropical year 10. The equation of time 11. The excentricity of the earth orbital around the sun. 12. The obliquity of the eclips 13. A compass function 14. The declination of the sun. 15. The moment of the perihelion 16. The moment of the aphelion 17. The moment of the next sun set 18. The Babylonic time 19. The Italian time Jos Kint --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- - Ing. Gianni Ferrari Via Valdrighi 135 - 41124 Modena 059 367989 - 349 3581301 Lat.44;38,18.5N Long. 10;56,05.3E gfme...@gmail.com --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: What can be calculated with a sun dial?
On a sundial shaped for that purpose, you can read where in the earth, the sun at that moment, is in the zenith. See on my website the sundial in Maaseik in Flanders (Belgium): http://www.wijzerweb.be/maaseik002A.html Click on the little pictures to enlarge them. Willy Leenders Hasselt in Flanders (Belgium) Visit my website about the sundials in the province of Limburg (Flanders) with a section 'worth knowing about sundials' (mostly in Dutch): http://www.wijzerweb.be Op 16-nov-2010, om 22:38 heeft Jos Kint het volgende geschreven: Dear sun dialists, What can be calculated with a good sun dial? Here is a list of 19 topics. Can you add some more items? 1. The hour of the day 2. The day of the year. 3. The solar altitude. 4. The solar azimuth. 5. The longitude of the sun dial. 6. The latitude of the sun dial. 7. The moment of the equinoxes 8. The moment of the solstices. 9. The length of the tropical year 10. The equation of time 11. The excentricity of the earth orbital around the sun. 12. The obliquity of the eclips 13. A compass function 14. The declination of the sun. 15. The moment of the perihelion 16. The moment of the aphelion 17. The moment of the next sun set 18. The Babylonic time 19. The Italian time Jos Kint --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
WG: Possible sundial in TV commercial
This sundial is situated at the Century Avenue in Shanghai-Pudong , China. Best regards Josef Pastor I've seen a United Parcel Service (UPS) TV commercial that includes something which looks like a possible sundial in the background. Here is a shot off the TV screen. Sorry for the poor picture quality. http://www.dickkoolish.com/rmk_page/RMK_Pictures/Sundial_TV/DSC_0167.jpg --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: What can be calculated with a sun dial?
Another addition: - UV radiation. It helps to read how dangerous the sun somtImes is for our skin. Fer. Fer J. de Vries De Zonnewijzerkring http://www.de-zonnewijzerkring.nl Molens http://www.collsemolen.dse.nl Eindhoven, Netherlands lat. 51:30 N long. 5:30 E - Original Message - From: Gianni Ferrari To: LISTA INGLESE Sent: Wednesday, November 17, 2010 11:02 AM Subject: Re: What can be calculated with a sun dial? Some new items (all in already built sundials): - The seasonal or temporary hours - The canonical time - The sideral time - The instant when a given star or constellation transits - The planetary hours - The beginning of the Zodiacal signs - The day of an important date (f.e. birthday, wedding anniversary, etc.) - The time in different cities in the world - The school timetable - The hours of light, that is to the Civil Twilight - The hours to the Astronomical Twilight - The time of the Islamic Prayer Zuhr (noon prayer) - The time of the Islamic Prayer ‘Asr (afternoon prayer) - The time of the Islamic Prayer Maghrib (sunset prayer) - The time of the Islamic Prayer Isha’ (night prayer, at the end of the astronomical twilight) - The direction of Mecca, that is the Islamic kibla Best wishes Gianni Ferrari 2010/11/16 Jos Kint jos.k...@skynet.be Dear sun dialists, What can be calculated with a good sun dial? Here is a list of 19 topics. Can you add some more items? 1. The hour of the day 2. The day of the year. 3. The solar altitude. 4. The solar azimuth. 5. The longitude of the sun dial. 6. The latitude of the sun dial. 7. The moment of the equinoxes 8. The moment of the solstices. 9. The length of the tropical year 10. The equation of time 11. The excentricity of the earth orbital around the sun. 12. The obliquity of the eclips 13. A compass function 14. The declination of the sun. 15. The moment of the perihelion 16. The moment of the aphelion 17. The moment of the next sun set 18. The Babylonic time 19. The Italian time Jos Kint --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- - Ing. Gianni Ferrari Via Valdrighi 135 - 41124 Modena 059 367989 - 349 3581301 Lat.44;38,18.5N Long. 10;56,05.3E gfme...@gmail.com -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: What can be calculated with a sun dial?
This list - together with all the additions - is great ! But, it would be nice to see which of the many items can be done well by a sundial and how many items would be a 'stretch'. To find the moment of equinox - for example - is theoretically possible - but in actuality is not realistic since the Sun's declination is changing so slowly at those times: (a problem the astronomers of antiquity struggled with). Equally, I think one would be hard pressed to find aphelion perihelion from a dial - except in a very indirect fashion. But let's get the list complete ! Best regards Kevin Karney On 16 Nov 2010, at 21:38, Jos Kint wrote: Dear sun dialists, What can be calculated with a good sun dial? Here is a list of 19 topics. Can you add some more items? 1. The hour of the day 2. The day of the year. 3. The solar altitude. 4. The solar azimuth. 5. The longitude of the sun dial. 6. The latitude of the sun dial. 7. The moment of the equinoxes 8. The moment of the solstices. 9. The length of the tropical year 10. The equation of time 11. The excentricity of the earth orbital around the sun. 12. The obliquity of the eclips 13. A compass function 14. The declination of the sun. 15. The moment of the perihelion 16. The moment of the aphelion 17. The moment of the next sun set 18. The Babylonic time 19. The Italian time Jos Kint --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: What can be calculated with a sun dial?
The longitude and latitude of the Sun (i.e., the location on the Earth that the Sun is directly above). On Wed, Nov 17, 2010 at 8:39 AM, Kevin Karney ke...@karney.com wrote: This list - together with all the additions - is great ! But, it would be nice to see which of the many items can be done well by a sundial and how many items would be a 'stretch'. To find the moment of equinox - for example - is theoretically possible - but in actuality is not realistic since the Sun's declination is changing so slowly at those times: (a problem the astronomers of antiquity struggled with). Equally, I think one would be hard pressed to find aphelion perihelion from a dial - except in a very indirect fashion. But let's get the list complete ! Best regards Kevin Karney On 16 Nov 2010, at 21:38, Jos Kint wrote: Dear sun dialists, What can be calculated with a good sun dial? Here is a list of 19 topics. Can you add some more items? 1. The hour of the day 2. The day of the year. 3. The solar altitude. 4. The solar azimuth. 5. The longitude of the sun dial. 6. The latitude of the sun dial. 7. The moment of the equinoxes 8. The moment of the solstices. 9. The length of the tropical year 10. The equation of time 11. The excentricity of the earth orbital around the sun. 12. The obliquity of the eclips 13. A compass function 14. The declination of the sun. 15. The moment of the perihelion 16. The moment of the aphelion 17. The moment of the next sun set 18. The Babylonic time 19. The Italian time Jos Kint --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
AW: What can be calculated with a sun dial? - A lot! But is it wise to build such dials??
So now, Mr. Kint, it is your turn to BUILD such a sundial with all its possibilities and not just to talk about it! :-) However it will turn out into an absolutely confusing object of no practical use at all. In Germany there had been a maths professor who tried hard to work out at least some aspects of your list and Gianni Ferraris good list. It is the sundial of J. C. Lüders in 18246 Bützow. You may find some pictures of it easily in my Schwarzes Brett if you scroll down half of the link. http://www.ta-dip.de/dies-und-das/schwarzes-brett.html The local gnomonists are very much excited about this now restored sundial, but sundials which stand/ hang on a public place ought to be beautiful and ought to enjoy people and not to confuse them! Best wishes to you! Reinhold Kriegler * ** *** * ** *** Reinhold R. Kriegler Lat. 53° 6' 52,6 Nord; Long. 8° 53' 52,3 Ost; 48 m ü. N.N. www.ta-dip.de http://de.youtube.com/watch?v=XyCoJHwzzjUfmt=18 http://de.youtube.com/watch?v=XyCoJHwzzjUfmt=18 http://www.ta-dip.de/dies-und-das/r-e-i-n-h-o-l-d.html http://www.ta-dip.de/dies-und-das/r-e-i-n-h-o-l-d.html -Ursprüngliche Nachricht- Von: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] Im Auftrag von Kevin Karney Gesendet: Mittwoch, 17. November 2010 14:40 An: Jos Kint Cc: sundial@uni-koeln.de Betreff: Re: What can be calculated with a sun dial? This list - together with all the additions - is great ! But, it would be nice to see which of the many items can be done well by a sundial and how many items would be a 'stretch'. To find the moment of equinox - for example - is theoretically possible - but in actuality is not realistic since the Sun's declination is changing so slowly at those times: (a problem the astronomers of antiquity struggled with). Equally, I think one would be hard pressed to find aphelion perihelion from a dial - except in a very indirect fashion. But let's get the list complete ! Best regards Kevin Karney On 16 Nov 2010, at 21:38, Jos Kint wrote: Dear sun dialists, What can be calculated with a good sun dial? Here is a list of 19 topics. Can you add some more items? 1. The hour of the day 2. The day of the year. 3. The solar altitude. 4. The solar azimuth. 5. The longitude of the sun dial. 6. The latitude of the sun dial. 7. The moment of the equinoxes 8. The moment of the solstices. 9. The length of the tropical year 10. The equation of time 11. The excentricity of the earth orbital around the sun. 12. The obliquity of the eclips 13. A compass function 14. The declination of the sun. 15. The moment of the perihelion 16. The moment of the aphelion 17. The moment of the next sun set 18. The Babylonic time 19. The Italian time Jos Kint --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: What can be calculated with a sun dial?
alignment hours (time to have the Sun in a plane) French revolution hours ciao Fabio Fabio Savian fabio.sav...@nonvedolora.it Paderno Dugnano, Milan, Italy 45° 34' 10'' N 9° 10' 9'' E GMT +1 (DST +2) - Original Message - From: Brad Lufkin To: Kevin Karney Cc: Jos Kint ; sundial@uni-koeln.de Sent: Wednesday, November 17, 2010 2:44 PM Subject: Re: What can be calculated with a sun dial? The longitude and latitude of the Sun (i.e., the location on the Earth that the Sun is directly above). On Wed, Nov 17, 2010 at 8:39 AM, Kevin Karney ke...@karney.com wrote: This list - together with all the additions - is great ! But, it would be nice to see which of the many items can be done well by a sundial and how many items would be a 'stretch'. To find the moment of equinox - for example - is theoretically possible - but in actuality is not realistic since the Sun's declination is changing so slowly at those times: (a problem the astronomers of antiquity struggled with). Equally, I think one would be hard pressed to find aphelion perihelion from a dial - except in a very indirect fashion. But let's get the list complete ! Best regards Kevin Karney On 16 Nov 2010, at 21:38, Jos Kint wrote: Dear sun dialists, What can be calculated with a good sun dial? Here is a list of 19 topics. Can you add some more items? 1. The hour of the day 2. The day of the year. 3. The solar altitude. 4. The solar azimuth. 5. The longitude of the sun dial. 6. The latitude of the sun dial. 7. The moment of the equinoxes 8. The moment of the solstices. 9. The length of the tropical year 10. The equation of time 11. The excentricity of the earth orbital around the sun. 12. The obliquity of the eclips 13. A compass function 14. The declination of the sun. 15. The moment of the perihelion 16. The moment of the aphelion 17. The moment of the next sun set 18. The Babylonic time 19. The Italian time Jos Kint --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
What can be calculated with a sun dial
Dear Willy, Gianni, Kevin, Brad, Harold and all other interested dialists, Thank you for all the nice suggestions. I will try to incorporate them in my explorations. My vertical sun dial measures 128 cm x 231 cm. The top of the gnomon comes 26,5 cm before the table. During 216 days of sun shine between January 22, 2008 and August 3, 2010 I did 1.015 observations. ( 4 or 5 times per day of sun shine). The following mean errors were found: 1. Hour of the day: 0'49 2. Day of the year: 1,3 days 3. Longitude of the sundial: 0°0,6' 4. Latitude of the sundial: 0°6,0' 5. Equation of time: less than 40 seconds 6. Solar declination: 0,5° 7. Vernal equinox: 1:52' hour 8. Summer solsice: 4:18 hour 9. Autumn equinox: 1:06' hour 10. Winter solstice: 2:32' hour 11. Aphelion: 1:56' hour 12. Excentricity: less than 2% ( mean e value = between 0,0167 and 0,0169) 13. Length of the tropical year: 1:09' hour Off course, these are mean values of the error. The individual observations were often less precise. It was a fascinating job. And it is still going on. Jos Kint 50°59'N 3°39'E--- https://lists.uni-koeln.de/mailman/listinfo/sundial
How to calculate a perforated ring dial's diagram?
I learned from a book (in teory) how to make an altitude ring sundial. 'Tis different from the equatorial ring, as it is devised specially for one certain latitude. My problem is that I can't manually lay out the hour/declination lines (to be transfered to the inner face of the ring) with the precision I want, my protractor has only 1 degree divisions, furthermore it is too much laborious to find the lines with pencil, eraser, protractor and compass. That's why I love equations and softwares, but it is very hard to find them for the altitude ring. Methinks it is somewhat like the shepherd's dial, except for 'tis an horizontal cylinder rather than a vertical one. Can I use the diagram of the shepherd's dial? But then, what would be the length of gnomon? How can I calculate the diagram? I mean, it seems for me that the diagram is essentially the same despite the latitude, that its dimensions depend only from the ring's radius and width, and that the specification of the latitude is determined by the orifice in the ring in relation to the diagram and the point of suspension. Here's a picture of a ring nearly identical to that I wanna make (mine hasn't a movable circle with the hole, it's constituted of but one ring): http://tiny.cc/h9tty Here is a link to a sketch I made that I hope will make clear my problem: tiny.cc/9dtgi Please be indulgent with my poor English. Thanks for your time! Marcelo Manilio --- https://lists.uni-koeln.de/mailman/listinfo/sundial
RE: What can be calculated with a sun dial?
The apparent diameter of the sun? The location of the North Star (Polaris) The declination of the wall to which it's attached Moon Time The name of the sundial maker The scientific awareness of the owner From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Jos Kint Sent: Tuesday, November 16, 2010 2:38 PM To: sundial@uni-koeln.de Subject: What can be calculated with a sun dial? Dear sun dialists, What can be calculated with a good sun dial? Here is a list of 19 topics. Can you add some more items? 1. The hour of the day 2. The day of the year. 3. The solar altitude. 4. The solar azimuth. 5. The longitude of the sun dial. 6. The latitude of the sun dial. 7. The moment of the equinoxes 8. The moment of the solstices. 9. The length of the tropical year 10. The equation of time 11. The excentricity of the earth orbital around the sun. 12. The obliquity of the eclips 13. A compass function 14. The declination of the sun. 15. The moment of the perihelion 16. The moment of the aphelion 17. The moment of the next sun set 18. The Babylonic time 19. The Italian time Jos Kint --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: How to calculate a perforated ring dial's diagram?
Marcelo, you can download my free software SONNE from my homepage www.helson.at or http://web.utanet.at/sondereh . This software SONNE also includes calculation and construction of Ring Dials. Good success Helmut Sonderegger - Original Message - From: Marcelo To: sundial@uni-koeln.de Sent: Wednesday, November 17, 2010 7:51 PM Subject: How to calculate a perforated ring dial's diagram? I learned from a book (in teory) how to make an altitude ring sundial. 'Tis different from the equatorial ring, as it is devised specially for one certain latitude. My problem is that I can't manually lay out the hour/declination lines (to be transfered to the inner face of the ring) with the precision I want, my protractor has only 1 degree divisions, furthermore it is too much laborious to find the lines with pencil, eraser, protractor and compass. That's why I love equations and softwares, but it is very hard to find them for the altitude ring. Methinks it is somewhat like the shepherd's dial, except for 'tis an horizontal cylinder rather than a vertical one. Can I use the diagram of the shepherd's dial? But then, what would be the length of gnomon? How can I calculate the diagram? I mean, it seems for me that the diagram is essentially the same despite the latitude, that its dimensions depend only from the ring's radius and width, and that the specification of the latitude is determined by the orifice in the ring in relation to the diagram and the point of suspension. Here's a picture of a ring nearly identical to that I wanna make (mine hasn't a movable circle with the hole, it's constituted of but one ring): http://tiny.cc/h9tty Here is a link to a sketch I made that I hope will make clear my problem: tiny.cc/9dtgi Please be indulgent with my poor English. Thanks for your time! Marcelo Manilio -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
New version of Calcad
Hello all, I am pleased to inform you that a new version of Calcad now is available at: http://pagesperso-orange.fr/ymasse/calcad/index_enu.htm Thanks to M. Brown, the manual is now corrected and more educational. This version should also satisfy fanatics of accuracy. Have a good use and nice sundials !... Yvon Massé --- https://lists.uni-koeln.de/mailman/listinfo/sundial
