What looks like an upside-down rainbow is actually a rare atmospheric spectacle called a circumzenithal arc. According to the San Francisco Chronicle: “it’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.”
I found this description of UpSide Down Rainbow:
ReplyDeleteWhat looks like an upside-down rainbow is actually a rare atmospheric spectacle called a circumzenithal arc. According to the San Francisco Chronicle: “it’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.”
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