# Solar angle of Incident calculation confusion! [closed]

How can I deal with an angle of incidence with greater than 90 degree values if I am calculating solar radiation?

## closed as unclear what you're asking by tinlyx, Barbarossa, whyzar, ArMoraer, HornbyddApr 30 '18 at 17:35

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• First of all I am confused with different formula available for solar angle of incidence calculation. If i follow the book by John A. Duffie William A. Beckman, there r 3 formula to calculate solar angle of incidence! I implemented all three, but all of them giving different answer. I don't know where is the problem! Even there are few values that are greater than 90 degrees, I know the reason why they are more than 90 but I dont know what to do with those values when calculating solar irradiation (beam / diffuse) formula. – Sukriti Bhattacharya May 1 '18 at 10:10