Why are there 7 colors in the rainbow?

There are seven colours of the rainbow. Isaac Newton originally divided the spectrum into five main colours – red, yellow, green, blue and violet – in 1672 but later added orange and indigo to make seven.

visual spectrum

In common with the Ancient Greeks he believed there was a connection between the number of colours in the spectrum and the number of days in the week, the number of notes in a musical scale and the number of objects then known in the solar system.

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