moon halo

Circle around moon

A moon halo is a ring of light appearing around the moon, caused by ice crystals in the upper atmosphere refracting moonlight.

The most common type forms a circle roughly 22 degrees from the moon.

Folk wisdom holds that a moon halo predicts coming rain or snow: There's a ring around the moon tonight—weather's changing.

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night sky · glow · pale glow · circumference · optical · winter · cold · frost · luminous · ethereal · omen · forecast · cirrus · refraction · pale · silvery · celestial · misty

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Opposites
atmospheric optical phenomena

moon halototal lunar eclipse

Moon fully within umbra

lunar eclipse · moonless night · new moon · solar eclipse · blood moon

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moon, halo, moons, halos, moonlit, moonlight, moonless, moony

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