Fire rainbows are the rarest of all naturally occurring atmospheric phenomena. For a fire rainbow to occur, cirrus clouds must be feet in the air with the precise amount of ice crystals, and the sun must hit the clouds at 58 degrees. (a/k/a Sun Doggies)
Swirling Peaceful Death / Subtle yet hurtful / Calm yet crazy / Dark clouds swirl /Snow white clouds sway behind / Wanting to help /But their friend has become /Demented / Nothing to do but endure / And hope He calms soon
Noctilucent clouds are crystals of ice hanging around 50 miles high in the atmosphere that catch the light of the sun long after it has set on the horizon. (VMD: The colors are a cloud phenomenon known as iridescence.