Quote:
Originally Posted by Sarge
Quarter moon clearly shining over Melbourne tonight, but there is a large and clear silver ring visible around it. I remember reading somewhere that it has to do with uper atmosphere temperatures. 
Can anyone explain it further or correct me?
Rod
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Sounds like you've seen a halo.
http://en.wikipedia.org/wiki/Halo_%2..._phenomenon%29
Occurs when moon or sunlight hits ice crystals in thin high altitude clouds.