This rainbow appears unusually low in the sky because it has formed early in the afternoon, rather than toward sunset. For a rainbow to form, water droplets must be present in the air in front of an observer and the sun must be shining from behind the observer. Rainbows result from the refraction and reflection of sunlight by these water droplets. (Bob Henson, via UCAR Digital Image Library)
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Hypolite Petovan
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