[Radiance-general] gendaylit

[Axel Jacobs]

Hi Hemshikha,

you need to include the site meridian, not just lat/lon:

-m 0 (if your time zone is GMT)

The default is -m 120

[axel at localhost ~]$ gendaylit -defaults
-g 0.200000			# Ground plane reflectance
-t 0.100000			# Atmospheric betaturbidity
-a 37.815214			# Site latitude (degrees)
-o 122.040010			# Site longitude (degrees)
-m 120.000281			# Standard meridian (degrees)

Regards

Axel


On 31/10/16 18:48, Saini, H. wrote:
> Hello everyone,
>
> While using gendaylit, I receive the following warning message and error in the outputs:
>
> # gendaylit 5 29 12 -L 925.2 249.348 -a 41.8 -o -12.2333
> Warning: sun altitude below zero at time step 5 29 12.00, printing error sky
> # Local solar time: 20.86
> # Solar altitude and azimuth: -13.2 135.6
>
> But if I use a '+' sign before hour then there is no warning message:
>
> # gendaylit 5 29 +12 -L 925.2 249.348 -a 41.8 -o -12.2333
> # Local solar time: 12.00
> # Solar altitude and azimuth: 69.7 -0.0
>
> Could you please tell me what would be the possible reason for such behaviour? I want to get solar altitude and azimuth angles based on standard time and not on local solar time.
>
> PS: I am using these Windows command prompt to execute gendaylit.
>
> Thanks,
>
> Hemshikha
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