sundog
A sundog is a rainbow-like spot in a cirrus cloud. Light shining through ice crystals in the cloud makes a sundog, much like light shining through raindrops makes a rainbow. "They are reddish on the side facing the sun and often have bluish-white tails stretching horizontally away from them," say David Lynch and William Livingston in Color and Light in Nature.
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Also by Myra Irving
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