DNI estimation models

irradiance.disc(ghi, solar_zenith, ...[, ...])	Estimate Direct Normal Irradiance from Global Horizontal Irradiance using the DISC model.
irradiance.dirint(ghi, solar_zenith, times)	Determine DNI from GHI using the DIRINT modification of the DISC model.
irradiance.dirindex(ghi, ghi_clearsky, ...)	Determine DNI from GHI using the DIRINDEX model.
irradiance.erbs(ghi, zenith, datetime_or_doy)	Estimate DNI and DHI from GHI using the Erbs model.
irradiance.boland(ghi, solar_zenith, ...[, ...])	Estimate DNI and DHI from GHI using the Boland clearness index model.
irradiance.campbell_norman(zenith, transmittance)	Determine DNI, DHI, GHI from extraterrestrial flux, transmittance, and atmospheric pressure.
irradiance.gti_dirint(poa_global, aoi, ...)	Determine GHI, DNI, DHI from POA global using the GTI DIRINT model.

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