Wednesday, December 30, 2009

Moon Dog




It's not uncommon to see sun dogs with all the blowing ice crystals in the North Dakota winter, but I can't remember seeing a full halo around the moon before!  I saw this "moon dog" last night.

It's the same phenomenon as a sun dog in that the ice crystals act as a prism.  It's the same reason you see a rainbow through mist.

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