Why Is There A Circle Around The Moon
Camila Farah

Many people observe halos around both the moon and the sun but it s not too common often occurs locally and may only last for an hour or so or even shorter.
Tiny ice crystals in earth s atmosphere create the halos. 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. The ring or halo effect is caused by the refraction of sunlight through ice crystals in the upper atmosphere around 3 6 miles above the earth. Halos are a sign of high thin cirrus clouds drifting 20 000 feet or more above our heads.
Why is there a ring around the moon. 7 5k views view 22 upvoters. If so you have seen a lunar halo. They do it by refracting.
This ring surrounding the moon is caused by the refraction of moonlight which is really reflected sunlight of course through ice crystals suspended in the upper atmosphere between 5 10 km in. But it s not just the moon that can tell us such a thing. The effect is known as a moon ring or winter halo credit. It s called a halo and it s caused by the presence of a specific type and orientation of ice crystals in the upper part of earth s troposphere.
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These clouds are very cold no matter how hot the surrounding climate is and they contain millions of six sided ice crystals. In other words seeing those icy clouds refracting light around the moon means cirrus clouds are present which might indicate a coming storm. While stargazing have you ever noticed a large circular band of light surrounding the moon. Wikipedia what causes a ring around the moon.
In short the visual phenomenon is caused by light refracting through hexagonal ice crystals. Known as a moon ring a winter halo or a 22 degree halo this optical phenomenon occurs when cirrus or cirrostratus clouds form high up in the atmosphere. Halos around the sun or moon are caused by high thin cirrus clouds drifting high above your head. Answered april 27 2017 the circle of clouds sometimes seen around the moon are cirrus clouds made up of tiny ice particles.
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