Moon Ring

A moon ring, also known as a winter halo, is a phenomenon that usually appears in conjunction with a full moon. There appears to be a whitish ring, approximately 10 to 20 times the size of the moon, surrounding the moon and centered on it. It is caused by refraction of the light from the full moon in the ice particles floating in the clouds, as opposed to a rainbow, where light refracts in the water vapor that makes up the clouds. It usually means bad weather is on the way:)