The Google graphics program called SketchUp has sun angles, dates, time
of day, and shadows built into it:
http://www.youtube.com/watch?v=geKxYlhz-LI
I think it will do what you need. The program is relatively easy to
learn, it's free, plus you can use it to waterproof your screens.
Take care, work safe and keep in touch.
John
by hammer and hand great works do stand
by pen and thought best words are wrought
John Leeke, American Preservationeer
26 Higgins St.
Portland, ME 04103
207 773-2306
[log in to unmask]
www.HistoricHomeWorks.com
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