Wikipedia:POTD row/April 18, 2006
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Crepuscular rays are rays of sunlight that appear to radiate from a single point in the sky. The name, used in atmospheric optics, comes from their frequent occurrences during twilight, where the contrasts between light and dark are the most obvious. Crepuscular rays are parallel, but appear to diverge because of linear perspective. They are often seen through sunlight shining through holes or breaks in cloud cover. Photo credit: Fir0002 |