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Solar panel angles in Iran

Optimal fixed-panel tilt and orientation for 6 cities in Iran, computed from solar geometry.

CityLatitudeOptimal tiltFacingFlat roof keeps
Tehran 35.69°N 32° south 87%
Mashhad 36.30°N 33° south 87%
Isfahan 32.65°N 30° south 88%
Karaj 35.83°N 33° south 87%
Tabriz 38.08°N 35° south 85%
Shiraz 29.61°N 28° south 90%

How these angles are calculated