During a total solar eclipse, gradually changing snake-like "shadow bands" may be seen on the ground just before & after totality:pic.twitter.com/o34H8FAMbE
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The comment about refraction can be put better: you can think of regions of turbulence as weird, tiny little lenses, bending light,
focusing it in some areas, and causing it to be more diffuse in others.
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But as to why it's in bands, I don't know. That's a surprise to me.
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