I'm doing a project where I have to rotate solar panels to track
the sun, I have found many websites where you can type in your
information and they tell you everything I need. My problem is I
don't understand where they get the information from! various
sites have lists of equations but they don't give enough
information for me to understand If some one knows how to do
this I would really appreciate it.  The information I expect to
get from June 21 2009 @ 12:15 (or 11:15 depending on day light
savings) is an azimuth angle of roughly 150 degrees  If possible
the steps between showing the equations would be very useful