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]
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