You wrote: "This is why there is a difference between seasonal and planetary hours...".
Where is the difference between seasonal and planetary hours? The Planetary hours are egual to the seasonal hours and are differently only for a philosophical and astrological concepts. All treatises of gnomonica on XVI-XVI-XVIIth century described the Planetary hours only for the astrological concepts. For this you can see Clavius, Vimercato, Kircher, etc. Nicola ---------- Initial Header ----------- >From : [EMAIL PROTECTED] To : [EMAIL PROTECTED] Cc : Date : Tue, 15 May 2007 22:37:10 +0300 Subject : Greek and Roman sundials > 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 > ------------------------------------------------------ Leggi GRATIS le tue mail con il telefonino i-modeĀ di Wind http://i-mode.wind.it/ --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
