Solar model for radiation calculations

I am searching for references on the particular solar model/algorithm used in Honeybee for the calculation of solar irradiation (beam, diffuse, reflected) at various directions.
Any help?
Thank you.

This link is a simple radiation analysis in ladybug but in case you mentioned, I think your analysis needs radiance material and some other stuff.

Thank you Nariman for your attention.
Actually I am looking for the theoretical model of radiation calculations starting from available EPW data.

You should look for EnergyPlus and/or radiance references. They are the simulation engines LBTools uses for it’s calculations.
They’ve been used plenty in research and are pretty much qualified.

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Thank you Abraham. This is the tip I was looking for: EnergyPlus solar model.