[Radiance-general] the solar position algorithm used in Radiance

[Mark Stock]

Ji,

If you are interested in this in a more general sense, you should 
consult the libnova library for astronomical calculations from 
Girdwood and Kubanek:

http://libnova.sourceforge.net/

I used this library to compute sun, moon, and planet positions 
for my "genutahsky" program, which implements most of the 
features of gensky and additionally outputs a colored sky, 
the moon and bright planets, and a star field.

http://markjstock.org/radiance/

Mark

On Tue, 29 May 2012, Ji Zhang wrote:

> Dear list,
>
> May I ask what is the exact algorithm used by gensky and gendaylit to
> calculate sun position in Radiance?
>
> i.e. given the latitude, longitude, standard meridian, month, day, hour,
> what's the formula used in Radiance to produce solar altitude and azimuth
> angles?
>
> Thanks!
>
> - Ji
>
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