Just as there are rainbows during the day, there can be moonbows at night. It must be raining opposite the moon and the moon must be nearly full and it can't be any higher than 42 degrees in the sky. It also has to be dark. All those factors combined together make for this atmospheric phenomenon to be fairly rare. This is also rare that I've used a reference image as a basis for a piece of art. Thanks to Rob Ratkowski of Hawaii for permission to use his photo of a rare treat.