I wish to estimate DHI and DNI from GHI using pvlib.irradiance.erbs. I first compute solar positions at the location in question using pvlib.Location.get_solarposition. Then I use the zenith angles and weather data GHI with erbs. Afterwards I adjust for solar tracking with pvlib.tracking.singleaxis and finally compute irradiance with pvlib.irradiance.get_total_irradiance.
I notice that pvlib.tracking.singleaxis and pvlib.irradiance.get_total_irradiance take apparent solar angles, pvlib.irradiance.erbs takes true zenith angle, while pvlib.Location.get_solarposition does not specify which kind.
This makes me wonder if, and how, I should correct for apparent vs true solar angle between these functions? And if so, which kind should I use with pvlib.Location.get_solarposition?