René Descartes was first who realised in 1637 that rainbows were caused by light from the sun being split into different colours by rain. The moist atmosphere of Titan, Saturn’s moon is ideal for formation of rainbow. Supernumerary rainbows are slightly detached and have pastel colour bands that do not fit the usual pattern.Ī moonbow or lunar rainbow is a rainbow produced by light reflected by the Moon.įogbow a phenomenon similar to a rainbow, produced by sunlight shining on fog.Įarth is the only planet in the solar system where rainbows are possible. They form when the sunlight reflects through ice crystals.Ī supernumerary rainbow-also known as a stacker rainbow-is an infrequent phenomenon, consisting of several faint rainbows on the inner side of the primary rainbow, and very rarely also outside the secondary rainbow. Upside down rainbows or cirumzenithal arcs can sometimes occur they are also known as sun smiles. Normally observed at either sunrise or sunset, a Monochrome requires a particular combination of atmospheric conditions to form. Unlike a double rainbow that consists of two separate and concentric rainbow arcs, the very rare twinned rainbow appears as two rainbow arcs that split from a single base.Ī Monochrome or Red Rainbow is a very rare variation of rainbow. Third and fourth and even multiple bows can sometimes be seen. If there is a double rainbow the colors of a secondary are in opposite order of the primary or first rainbow. Rainbows can also be viewed around waterfalls, sea spray and geysers. Viewers in aircraft can sometimes see these circular rainbows. Rainbow actually occurs as a full circle, but since we watch it from ground it appears as an arc. The most familiar type rainbow is made when sunlight strikes raindrops in front of a viewer at a precise angle of 42 degrees. Each “color” shades imperceptibly into the next with no hard boundary other than those imposed by human observers of different cultures. The order of the Rainbow spectrum is red, orange, yellow, green, blue, indigo, violet.īut there aren’t really seven colors in a rainbow, nor any particular number. Sir Isaac Newton discovered the seven distinct colors of the visible spectrum.
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