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Originally Posted by jab2
Turtle, I do not want to advertise my ignorance on the subject, but do you measure to know it's a 22deg halo or are the some underlying physics I missed? If measured please provied method. Thanks.
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my bad.
it is a physical effect, yes. i didn't measure it because it's always the same size. here's some info on halos.
22 Degree Halo: a ring of light 22 degrees from the sun or moon
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...Halos form when light from the sun or moon is refracted by ice crystals associated with thin, high-level clouds (like cirrostratus clouds). A 22 degree halo is a ring of light 22 degrees from the sun (or moon) and is the most common type of halo observed and is formed by hexagonal ice crystals with diameters less than 20.5 micrometers....
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so too is the 46 degreee halo a physical phenomena.
46° halo - Wikipedia, the free encyclopedia
