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- 1) cos(aoi) = cos(lat - slp) cos(decA) cos(hrA) + sin(lat - slp) sin(decA)
- 2) cos(aoi) = cos(zn) cos(slp) + sin(zn) sin(slp) cos(azm - azm_s)
- both the azimuth angles (solar and surface) are calculated from north clockwise ranging from (-180 to +180).
- a) why these two incidence angle values are different!
- b) which one is the correct way to calculate the angle of incidence!
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