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Sundogs
mock suns or parhelia

Sundogs, also known as mock suns or "parhelia", are a pair of brightly colored spots, one on either side of the sun.


Photograph by: Rauber
Sundogs form as sunlight is refracted by hexagonal plate-like ice crystals with diameters larger than 30 micrometers and their flat faces horizontally oriented.


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Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.