thumb|right|300px|Semicircular double rainbow. Supernumerary rainbows on the inside of the primary arc. Shadow of the photographer marks the centre of the rainbow circle (antisolar point). A rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky when the Sun shines onto droplets of moisture in the Earth's atmosphere. They take the form of a multicoloured arc, with red on the outer part of the arch and violet on the inner section of the arch. 90px A rainbow spans a continuous spectrum of colours; the discrete bands are an artefact of human colour vision. The most commonly cited and remembered sequence, in English, is Newton's sevenfold red, orange, yellow, green, blue, indigo and violet (popularly memorized by mnemonics like Roy G. Biv). Rainbows can be caused by other forms of water than rain, including mist, spray, and dew. Rainbows may also form in mist, such as that of a waterfall Rainbow with a faint reflected rainbow in the lake

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