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 <[email protected]> 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 [email protected] ------------------------------------------------------------------------------ --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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