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Hevelian halo

[huh-vey-lee-uh n] /həˈveɪ li ən/
noun
1.
a faint white halo with an angular radius of 90° that is occasionally seen around the sun or the moon, thought to be caused by the reflection and refraction of sunlight by ice crystals.
Origin
after J. Hevelius; see -ian
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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