images

Lunar Halo

by

G.Cannat/Novapix

Reference

t-met03-80010

Date

2009-02-18

Lunar halos are caused by moonlight being refracted by cirro-stratus clouds. These thin clouds are located very high in the atmosphere, and are composed of ice crystals. They bend light at a 22 degree angle, which creates a halo that is 44 degrees in diameter. January 10 2009.