A moonbow (also known as a lunar rainbow or white rainbow) is a rainbow that occurs at night. Moonbows are relatively faint, due to the smaller amount of light from the Moon. As with rainbows, they are always in the opposite part of the sky from the moon
A meteorological phenomenon also known as a lunar rainbow or white rainbow, well documented at Cumberland Falls near Corbin, Kentucky, Victoria Falls in Africa as well as other places such as Yosemite National Park