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Why do we sometimes see a circle around the moon?

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Why do we sometimes see a circle around the moon?
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Ice crystals in the upper atmosphere refract and reflect the sunlight which is itself reflected from the Moon. Under just the right conditions, you get the appearance of a ring.
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Every time you see that ring.. An angel gets it's wings.. . No, not really, it's actually moisture and particles in the atmosphere, refracting or redirecting the moon's light that causes moonbows.
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The ring appears during the Eclipse, when the sun covers it and a very little light from a corner comes out it appears like a shiny diamond ring
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its clouds forming aroung the moon
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You should read the Moon description in http://en.wikipedia.org/wiki/Moon Its fascinating!
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Dig it, some pretty cool stuff on there.
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It's called a halo. It appears when there are cirrostratus clouds in the sky (at about 10000 m or 30000 ft altitude). The light from the moon is refracted in the ice crystals of the clouds.. . A halo can appear around the sun as well.
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atmospheric pressure
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Because of the water mollecules in the terrestial atmosphere.
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never seen that
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