You may have heard the saying ‘A ring around the moon, means rain is soon”, but what does science say about these moon rings?Many saw a ring around the moon, also called a moon halo, with the recent full moon over Oklahoma.  As moonlight shines through a thin layer of cloud cover made up of ice crystals, the moonlight is then reflected into a halo.This is the same process as light from a flashlight moving through a thin plastic lens, and then when you shine the light on a wall a halo surrounds the light.  As far as rain, in advance of a large storm high cirrus clouds are common.  If the timing is right, a halo can be seen around the moon before the rain.  This would verify the saying ‘ A ring around the moon means rain is soon’.Of course high clouds can still be present without a rain storm on the way, so this saying isn’t always the case.