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Residents in Singapore were treated to a truly unusual phenomenon, as a so-called fire rainbow lit up the sky in the city-state. NASA says that fire rainbows are actually called circumhorizon arcs, which are created by a unique set of circumstances. A spokesman said: "The sun must be at least 58 degrees high in a sky where cirrus clouds are present. Furthermore, the numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight like a single gigantic prism. Therefore, circumhorizon arcs are quite unusual to see."