[Radiance-general] Radiance sun position formula, solar position algorithm

[Mark Stock]

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

On Thu, 31 Jan 2013, jeffn wrote:

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