Ever look up at the moon on the clear night and notice a "halo" of light around it? No, its not a sign that the world is coming to an end. It's actually very interesting phenomenon.
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| http://en.wikipedia.org/wiki/File:Moon_Ring_01.jpg |
The ring is caused by a refraction of light through ice crystals (mainly thin cirrus clouds) in the upper atmosphere. The crystals have a hexagonal shape to them which causes the ring around the moon. The ring will typically be the same size (22° across the sky) due to the hexagonal shape of the crystals.
Folklore says that the ring indicates that bad weather is coming. The cirrus clouds usually come before a warm front and low pressure system which tends to bring stormy weather. Also, some say that the amount of stars inside the ring indicate how many days till the stormy weather arrives. Does this work? Check it out sometime...
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