Azimuth angle of the sun (0 to 360 degrees).
phi0 value
-
Sun in the South: 0 degrees
-
Sun in the West: 90 degrees
-
Sun in the North: 180 degrees
-
Sun in the East: 270 degrees
For all one-dimensional solvers the absolute azimuth does not matter, but only the relative azimuth phi-phi0.