Radiance sun position formula, solar position algorithm

Jeff,

If you're willing to go a little farther, you can get more accurate with a little work. Install libnova, an astronomical library, and then genutahsky, my full-color Radiance sky module. Sun positions use a pretty intense calculation, and are even color-shifted at low angles based on turbidity.

http://libnova.sourceforge.net/
http://markjstock.org/radiance/

Mark

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On Thu, 31 Jan 2013, jeffn wrote:

Yes, everything is within 1 degree agreement with the corrected
longitude/meridian input.
Thanks,
Jeff