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A circumhorizontal arc often called a fire rainbow, is an optical phenomenon in which an ice halo forms by hexagonal, plate-shaped ice crystals in high-level cirrus clouds. The halo is so large that the arc appears parallel to the horizon, hence the name.

When the sun is very high in the sky, sunlight entering flat, hexagon-shaped ice crystals get split into individual colours just like in a prism.

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odO7 TIL that, in 1948, a psychologist gave a group of his students a test that he said could summarise their personalities. Upon receiving their summaries one week later, the students gave them an average accuracy score of 85.2%. In reality, the students had all received the exact same summary.
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