I know it as a moon dog. The moon has to be pretty much full for us to see one (a necessary but not sufficient condition), so it's rarer than a sun dog.
Just another refraction trick like a sun dog or a rainbow.
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"For thousands of years humans were oppressed - as some of us still are - by the notion that the universe is a marionette whose strings are pulled by a god or gods, unseen and inscrutable." - Carl Sagan
Freedom consonant with responsibility.
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