Weather Trivia : Fire Rainbow is different from rainbow
A circumhorizontal arc is an optical phenomenon - an ice-halo formed by the refraction of sun or moonlight in plate-shaped ice crystals suspended in the atmosphere.
A circumhorizon arc always has a fixed location in the sky in relation to the Sun or Moon (namely below it at an angle of 46°), while rainbow occurs in different positions (often directly around the Sun or Moon).
