Other

irradiance.dni(ghi, dhi, zenith[, ...])	Determine DNI from GHI and DHI.
irradiance.complete_irradiance(solar_zenith)	Use the component sum equations to calculate the missing series, using the other available time series.
irradiance.diffuse_par_spitters(...)	Derive daily diffuse fraction of Photosynthetically Active Radiation (PAR) from daily average solar zenith and diffuse fraction of daily insolation.
albedo.inland_water_dvoracek(solar_elevation)	Estimation of albedo for inland water bodies.