John, If you use a calendar with zodiacal signs only 6 rings ( 7 circles ) are needed and each ring acts for 2 signs. In such a way a 8 shaped figure for the EoT will appear on the azimuthal dial.
As in the book of Mayal it isn't fully correct. Best, Fer. Fer J. de Vries [EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E ----- Original Message ----- From: John Carmichael <[EMAIL PROTECTED]> To: T.& M. Taudin-Chabot <[EMAIL PROTECTED]> Cc: <[email protected]> Sent: Tuesday, February 22, 2000 3:43 PM Subject: Re: azimuthal gnomon length problem > Hi Thibaud: > > you suggested the following following solution to the Azimuthal gnomon > height problem: > > >How about making concentric rings for each declination, the innermost for > >+23.44 and the outermost for -23.44 > > I thought about this ring order also and have not rejected it. If you look > at Mayall's azimuthal dial on page 181, you will see that he does something > similar to what you propose, by combining two months in each ring. (In his > version, however, he places the summer months on the outside instead of the > inside and he doesn't correct for the EOT or longitude). > > Someone wrote you back and said that your idea wouldn't work because it > would produce the traditional analemma shaped hour lines. But I'm not so > sure he was correct, because that kind of dial requires a nodus and an > azimuthal dial does not. > > John C. > >
