Submitted by Supreme_MangoKat t3_109vr31 in askscience
Puppy-Zwolle t1_j43lc6s wrote
All excellent explanations.
In short. There is no halo to measure. It's 'just' refraction that makes you see a halo. Same as the rainbow. It's a trick of the light. 'Smoke and mirrors' but done by nature.
Here's a video. Not about halos but about rainbows but the explanation is the same.
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