
124 Project development in the solar industry
of the sun will be an East to West arc tilted to the geographical South. In summer sol-
stice, the sun reaches an elevation of 90 degrees at the Tropic of Cancer, or a zenith of
0 degrees at solar noon. If the latitude of the location is known, the maximum zenith
angle of the sun can be easily estimated by subtracting 23.5 degrees from the latitude.
The maximum elevation is the complement of the zenith angle, or 90 degrees minus
the zenith angle. For example, the city of San Francisco in the United States is located
at 37.75 degrees latitude. Therefore, the maximum elevation of the sun at this loca- ...