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You can observe this effect to a much lesser degree whenever the sun is high and cirrus is present...if you look through polarized sunglasses. I assume that the polarization only allows the light passing through the properly oriented ice crystals to pass, so you can see a refraction that is otherwise masked by glare.
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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