ref: http://www.new-learn.info/packages/clear/thermal/climate/sun/sunpath_diagrams.html
Earth rotates about on a fixed plane that is tilted 23.5°
Averaged, the Earth will complete one rotation every 24hrs (based on a solar day) and thus moves at a rate of 15° per hour (one full rotation is 360°).
For northern hemisphere, the shortest solar day occurs around December 21 (winter solstice) and the longest solar day occurs around June 21 (summer solstice).
time the earth takes to move around the sun is approximately 365 days. This path that the earth takes to revolve around the sun is called the elliptical path.
The angle between the earth- sun line and the earth"s equatorial plane is known as the angle of declination.
Searched for "sun path diagrams" and came up with this great site:
http://wiki.naturalfrequency.com/wiki/Solar_Position
Look in the back of the MEEB book (Mechanical and Electrical Equipment for Buildings)
