Illumination angle
In computer graphics and geography, the illumination angle of a surface with a light source (such as the Earth's surface and the Sun) is the anglebetween the inward surface normal and the direction of light.[1] It can also be equivalently described as the angle between the tangent plane of the surface and another plane at right angles to the light rays.[2] This means that the illumination angle of a certain point on Earth's surface is 0° if the Sun is precisely overhead and that it is 90° at sunset or sunrise.
See also[edit]
https://en.wikipedia.org/wiki/Illumination_angle
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