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This
is an easy question to answer. The NASS DeltaCad macros written by the late
Ron Anthony do just what you specified. They are available on the NASS website,
specifically at http://www.sundials.org/links/local/deltacad/ The
specific macro to to do exactly what you specified is "horizontal7.bas" but look
at the others to see how features like wide gnomon and declination are
added. The source code can be read and edited in DeltaCad, any BASIC
compiler or even with a text editor. The documentation is excellent so the
macros are easy to change to suit your specific design. Only the usual three
declination lines are built into the program. You will have to do a little
editing (hacking) of the basic program for other independently selected
dates and declinations. The "horizontal7.bas" macro is only 33.8 kb, almost
small enough to get through the mailing list size filter. It even does the 6
o'clock style shift for the wide gnomon!
You do
require DeltaCad. The NASS website link above tells you where to obtain a copy.
You can download the free 45 day demo version that has all the features to allow
you to see how effective these tools are.
My
thanks to Ron Anthony and the other contributors (Fer De Vries, Fred Sawyer
etc.) for making these simple but effective tools available.
Roger
Bailey
Walking Shadow Designs
N
48.6 W 123.4
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