Thats nice angle finder and only ten bucks. Is it me or did they take a picture of it upside down but set the picture rightside up?
To answer your question Tech Guy, or at least what I think your asking, I just use this
http://rredc.nrel.gov/solar/old_data/nsrdb/redbook/atlas/and this, at least once to set the foundation.
http://howto.altestore.com/Library-Articles/Solar-Electric-Power-or-PV-Systems/Magnetic-Declination-Finding-True-South/a60/ If you want to make sure that a flat surface, such as PV module, is perpendicular to the Sun, around noontime (or anytime the Sun is up) you can stand up a short block of 2x4 wood (about a foot long that you know is cut square on the end) to the surface. When there is no shadow any where around the wood block the surface is perpendicular to the Sun. Don't forget though, the Sun is always changing its position in the sky, all day everyday.
I set my PV modules to face a little west of south on a compass, "solar south" in my neck of the woods. On the shortest day of the year, winter solstice, December 21, at 12:00 noon, a 2x4 block casts no shadow. On the longest day of the year, summer solstice, June 21, that doesn't happen until about 1:30. Obviously on ether of the two equinox it falls in between those two times. If any of this is of intrest to you, you may want to research the analemma as well. Just as a note of interest, did you know that the other planets in our solar system form analemmas of their own. Jupiters is eliptical while oddly enough, Mercury's is a striaght line.
Something I've been wanting know about the word equinox.
Is it already plural, like the word fish?
Do we use equinoxs, equinoxes, eqionox's, or is it just equinox, vernal and autumnal? For that matter, how about the word solstice. Would it be solsticees?
