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A lunar halo is caused by the refraction, reflection, and dispersion of light through ice particles suspended within thin, wispy, high altitude cirrus or cirrostratus clouds. As light passes through these hexagon-shaped ice crystals, it is bent at a 22 degree angle, creating a halo 22 degrees in radius (or 44 degrees in diameter). A double halo, sometimes with spokes, may be seen on rare occasions when light reflects off water or ice.
Originally posted by StoneGarden
St. Catharines Ontario Canada 12:50am
BIG ring in the clouds around the moon. I just found this pretty interesting and didnt know where to post...
pictures and edit to follow
Originally posted by jcord
Op, that is uncanny! How in the world did you know that we have up where I live?
Originally posted by StoneGarden
Originally posted by jcord
and now thanks to a Pirate here at ATS, I am expecting Snow.
Weather lore says a lunar halo is the precursor of impending unsettled weather, especially during the winter months. This is often proved true, as cirrus and cirrostratus clouds generally precede rain and storm systems.