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This is an atmospheric optical affect. Crepuscular rays, in atmospheric optics, also known as sun rays, God's rays or the Fingers of God, are rays of sunlight that appear to radiate from a single point in the sky. These rays, which stream through gaps in clouds or between other objects, are diverging columns of sunlit air separated by darker cloud-shadowed regions. The name comes from their frequent occurrences during crepuscular hours (those being dawn and dusk), when the contrasts between light and dark are the most obvious. Various airborne compounds scatter the sunlight and make these rays visible, due to diffraction, reflection, and scattering. Crepuscular rays are near-parallel, but appear to diverge because of linear perspective. If you stand next to a brick wall and look down it horizontally, you will see that the lines diverge.
Also by David Lee Tiller
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