What causes an upside-down rainbow?

Answer

An upside-down rainbow is a rare phenomenon caused by refraction of sunlight through horizontally-oriented ice crystals. This usually occurs in cirrus stratus clouds rather than raindrops. It is also known as circumzenithal arc.
Q&A Related to "What causes an upside-down rainbow?"
Also known as a circum-zenith arc. If you've seen one, you're very lucky, since they are quite rare. I have seen one only twice in my life, and I'm the kind of guy who looks. Ice
http://answers.yahoo.com/question/index?qid=200908...
Moonstones have a "lamellar" construction, which is one composed of multiple layers of alternating materials. This construction frequently results in a cloudy visual effect
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Anna Nio.
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Many things can cause temporary blindness such as cataract,
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