I think my question may not have been clear. What I am interested in finding out is 1) Greek and roman sundials break up the day into 12 equal parts but the amount of time that will pass between each part will not be equal as the first and last hour will be longer by approximately 5 minutes due to refraction. This is why there is a difference between seasonal and planetary hours 2) If a Greek or Roman sundial was set up correctly according to what they thought was correct, would it actually tell seasonal hours accurately or not? The part that makes me wonder is the angle of the gnomon.
3) Is there any formula to calculate what would be the seasonal time on a Greek sundial that was accurately set up? Fred Sawyer gives the formula for the unequal hours http://www.sundials.org/publications/dcomp/dcomp2.htm Thanks again, Noam Kaplan ----- Original Message ----- From: Noam Kaplan To: [EMAIL PROTECTED] Sent: Tuesday, May 15, 2007 2:25 PM Subject: Greek and Roman sundials Does anyone know if the Greek and Roman sundials would in actuality show what they are theoretically supposed to show in term of the unequal hours? The gnomon was either horizontal or vertical, not on an angle. Thanks, Noam Kaplan
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