Airmass and atmospheric models

location.Location.get_airmass([times, ...])	Calculate the relative and absolute airmass.
atmosphere.get_absolute_airmass(airmass_relative)	Determine absolute (pressure-adjusted) airmass from relative airmass and pressure.
atmosphere.get_relative_airmass(zenith[, model])	Calculate relative (not pressure-adjusted) airmass at sea level.
atmosphere.pres2alt(pressure)	Determine altitude from site pressure.
atmosphere.alt2pres(altitude)	Determine site pressure from altitude.
atmosphere.tdew_from_rh(temp_air, ...[, coeff])	Calculate dewpoint temperature using the Magnus equation.
atmosphere.rh_from_tdew(temp_air, temp_dew)	Calculate relative humidity from dewpoint temperature using the Magnus equation.
atmosphere.gueymard94_pw(temp_air, ...)	Calculates precipitable water (cm) from ambient air temperature (C) and relatively humidity (%) using an empirical model.
atmosphere.bird_hulstrom80_aod_bb(aod380, aod500)	Approximate broadband aerosol optical depth.
atmosphere.kasten96_lt(airmass_absolute, ...)	Calculate Linke turbidity using Kasten pyrheliometric formula.
atmosphere.angstrom_aod_at_lambda(aod0, lambda0)	Get AOD at specified wavelength using Angstrom turbidity model.
atmosphere.angstrom_alpha(aod1, lambda1, ...)	Calculate Angstrom alpha exponent.
atmosphere.windspeed_powerlaw(...[, ...])	Estimate wind speed for different heights.