Why is the rare moon halo perfectly round? Submitted by Supreme_MangoKat t3_109vr31 on January 12, 2023 at 9:45 AM in askscience 11 comments 45
aspheric_cow t1_j42utzm wrote on January 12, 2023 at 8:12 PM Ice crystals refract light by ~22 deg. There are ice crystals everywere doing this. But you only see the ones that refract light towards you, which are the ones ~22 deg away from the Moon from your vantage point. Permalink 3
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