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Yep - it the moon's light being dispersed by water vapor. There folk aphorism about "if there is a ring around the moon there will soon be rain" but I cannot remember it, only the meat of the saying. I don't believe it is true but may have a small connection.
What you are seeing is caused by cirrus clouds, the folklore "if there is a ring around the moon there will soon be rain" relates to the cirrus being the leading part of an approaching warm front.Warm fronthttp://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/frnts/wfrnt/def.rxml22° Halo around the moonhttp://www.atoptics.co.uk/halo/circmoon.htm