What the?
Quote:
Two different optical effects .... the common rainbow .... More rare, and perhaps more striking, are the rays of light that emanate out from the horizon above the canyon. These are known as anticrepuscular rays and result from sunlight streaming though breaks in the clouds, around the sky, and converging at the point 180 degrees around from the Sun. Geometrically, this antisolar point must coincide with the exact center of the rainbows.
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Cool. I've seen sunbeams poking through trees and down through clouds, but never with the sun behind me so that the beams all converge on a single point in the distance. I'll have to keep an eye out for that effect in the future.