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In response Kim Runner to her Publication
I'd never seen a circumzenithal arc until 12-21-12. The sun was about to set in the SSE. But the arc wasn't perpendicular to the sun, but parallel. I have a few photos somewhere. They're common, but the location (high in the sky) and angle were odd.
https://www.youtube.com/watch?v=Af9s0p0xjO8
interesting - thanks for sharing.