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Position of the sun center a azimuthal angle, p polar angle. The azimuthal angle indicates the position of the sun relative to 0 degree north, where degrees proceed clockwise. The polar angle indicates the height of the sun, where 0 degree is directly above, at zenith, and 90 degree at the horizon. When this property is ommitted, the sun center is directly inherited from the light position.
This is an Expression representation of "sky-atmosphere-sun".