Air Mass
This function empirically computes the non-pressure-corrected (sea level) and pressure-corrected (at altitude) air
masses as a function of the solar zenith angle.
Inputs
Outputs
Algorithm (Bird & Hulstrom Version)
Compute the sea-level air mass:
Algorithm (Kasten / Sandia Version)
Compute the sea-level air mass:
Algorithm (Common Pressure Correction and Filtering)
1.) Restrict the calculation of the air mass for zenith angles less than 89°
data):
Reference
Bird, R., Hulstrom, R., A Simplified Clear Sky Model for Direct and Diffuse Insolation on Horizontal Surfaces, 1981
NREL SERI/TP-642-761
Kasten, F. Discussions on the Relative Air Mass, Light Research Technology 25, 129.