A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multi-coloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

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Keywords: arc, archival, archive, circular, colour, dispersion, droplets, historical, history, light, meteorological, meteorology, multi-coloured, phenomenon, rainbow, reflection, refraction, sky, spectrum, water, weather