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

[Ji Zhang]

Thanks for the advice, Mark and Pally, I'll take a look! It seems there's a
sun.cal file in Radiance library. I'll try to figure it out how it works.

- Cheers, Ji


On Tue, May 29, 2012 at 9:58 PM, Mark Stock <mstock at umich.edu> wrote:

> 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/ <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/ <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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