What looks like an upside-down rainbow is actually a rare atmospheric spectacle called a circumzenithal arc.  “t’s an unusual phenomenon caused by sunlight shining through a thin, invisible screen of tiny ice crystals high in the sky and has nothing at all to do with the rain.”

Feel free to be scientifically correct, but I’ll stick with calling it an “upside-down rainbow” … “circumzenithal arc” just doesn’t  sound as good

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