|Azimuth Angle||close window|
The solar azimuth angle is the angular distance between the zero azimuth (either due South or due North, depending on what you select on the input screen) and the projection of the line of sight to the sun on the ground.
The azimuth angle is measured clockwise from the zero azimuth. For example, if you're in the Northern Hemisphere and the zero azimuth is set to South, the azimuth angle value will be negative before solar noon, and positive after solar noon.
The azimuth angle is calculated as follows:
The sign of the azimuth angle may need to be adjusted when using the above equation, depending on the zero azimuth.
Note that SunAngle now allows for North to optionally serve as the zero-azimuth instead of South. This can be selected in the inputs section above.
Thanks to Oddbjorn Grandum for the updated azimuth angle calculation, which is accurate for results > 90 degrees, and to Terry Leier for additional refinements!