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Sundog Light Phenomenon, Manitoba, Canada, 2005

A solar phenomenon known as a sundog arcs over the tundra in Churchill, Manitoba, Canada. Sundogs are fairly common occurrences in the Arctic and Antarctic. They form when the sun is near the horizon and ice crystals high in the sky line up in a way that bends the solar rays like a prism.

(Photo shot on assignment for, but not published in, "Refuge in White: Winter in a Canadian National Park," December 2005, National Geographic magazine)

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Photograph by Norbert Rosing