I once say a circular rainbow the diameter of the sun, is this the result of this phenonmena?
Probably not. Were you in an airplane at the time?
No I was on land, Granada Spain, at 4:00PM no clouds in the sky and the rainbow was a good distance from the sun about a 45 degree angle off horizon. Water vapor in a concentrated are, maybe a comet burnout in high atmosphre. The country is notorious for sky phenonema, you know we have large chucks of ice fall from the sky, that has no explanation either.
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