images

Lunar Halo

by

Alex Conu/Novapix

Reference

t-met03-80016

Date

2017-02-04

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.