Last night around 11:30pm my friend sent me a text saying go outside and look at the ring around the moon. At first I thought it was just some form of prank, but my curiosity got the best of me and I went outside and took a look. When I got outside what I saw in the sky was a wonderful ring around the moon. This is considered a lunar halo or possibly a lunar corona. A lunar halo is caused by the refraction, reflection, and dispersion of light through ice particles suspended within thin, wispy, high altitude cirrus or cirrostratus clouds. As light passes through these hexagon-shaped ice crystals, it is bent at a 22 degree angle, creating a halo 22 degrees in radius (or 44 degrees in diameter). A double halo, sometimes with spokes, may be seen on rare occasions when light reflects off water or ice. The phenomenon of a lunar halo is similar to a rainbow produced by sunlight and rain falling between your eye and the sun.