equinoctial hours

[Noam Kaplan]

Can anyone comment on this? To define the concept of mean time, consider two fictitious mobiles (suns): 1. The ecliptic mean sun or the mean position of the sun. It is the same mean sun as the one from the Almagest, Al-Battani, and Maimonides. Today, it is called the fictitious sun. It moves on the ecliptic at the mean solar velocity of 360° per tropical year, and it coincides with the true sun at the perigee (currently January 3) and at the apogee (currently July 4). source: http://www.ajdler.com/jjajdler/EoT.pdf Thanks, Noam Kaplan 31.651756 N 35.126424 E On 8/4/2015 5:59 PM, Karlheinz Schaldach wrote: In the meanwhile there are at least 6 equatorial dials known from antiquity, some were made for temporal hours, some for equinoctial hours, some were done with a polar, some with a horizontal gnomon, all happened in the 4th or the 3rd cent. BC. You may have a look at the not yet completed digital archive of Greco-Roman sundials http://repository.edition-topoi.org/projektinfo.php?project=BSDP Karlheinz (hope my posting works now with the new email address)   --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial

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