Robert, My I suggest that you lay out the lines as follows; Determine the longitude and latitude of the "equivalent" horzontal dial for your declination/reclination, then simply use the standard horzontal layout formula [tan(s)=sin(lat)*tan(h)] for that equivalent location. Fred has written several articles in the compenduim on how to do this--I'ld have to look them up to be more specific.
Bill Gottesman In a message dated 3/23/2001 1:08:44 PM Eastern Standard Time, [EMAIL PROTECTED] writes: > Subj: Reclining/Declining > Date: 3/23/2001 1:08:44 PM Eastern Standard Time > From: [EMAIL PROTECTED] (Shadow Maker) > Sender: [EMAIL PROTECTED] > To: [email protected] > > I have built some horizonal, vertical and vertical/declining dials and I > am > now ready to build a reclining/declining dial, that will compensate for > standard time (that part is easy). > > I have read what Mayall/Mayall, Waugh and Rohr have written about the > layout process. I would prefer to use the trig formulas for SD, SH and > HourAngles because I can use them in a PostScript file that will render the > dial face and print out the values of all of the angles. Rohr does show the > > formulas for SD and SH but, like the others, he recommends a graphic layout > method instead of a computational method > for the hour line angles. I was hoping that all of the trig formulas would > be available, but can't find them. Waugh says that older editions of the > Encyclopedia Britannica had all the trig formulas but dropped them a hundred > > years ago. > > Can anyone help? > > Robert Hough > [EMAIL PROTECTED]
