Hello Valentin, Welcome to the list and thanks for your contribution.
I downloaded your postscript file and calculated a Quadrant sundial. In fact these are portable sundials and you may find them in several shapes. The program worked well and thanks for sharing it with us.. About the Amsterdam sundials: You stated: > The face of a "classical" sundial is the projection of a SINGLE POINT, > which is at some distance from the surface (usially flat). Therefore THE > BASIC POINT OF THE STYLE IS IRRELEVANT !!! In fact this is correct, however the Amsterdam sundials are dials with a pole style as shadow caster and the dial may be read with the entire line of shadow of that pole style. For such dials the pole styles MUST be parrallel, even for a dial in Amsterdam and Harare. But the remark was that the styles weren't parallel. This could be because one of the styles wasn't mounted correct, as stated before. Another reason can be as it looks like the styles aren't parallel. The circular dial in top of the chursh is directly mounted to the wall which wall declines some degrees to the east. The smaller dial at another spot of the same wall is a south facing dial and is angled to the wall with the same wall-declination. So it might be an optical effect. I haven't the correct answer, I just gave a possible reason. The smaller dial at this church in fact is a triple sundial. It is a rather thick stone on which the south facing dial is drawn and on the west and east side of the stone also a sundial is drawn. Best wishes, Fer. Fer J. de Vries mailto:[EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E ----- Original Message ----- From: "Dr. Valentin Z. Hristov" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, July 28, 2002 8:31 AM Subject: Some ideas for constructing sundials > Dear Dialists, > snip.... -
