10/14/2023 0 Comments Out of the blue hips don t lie![]() ![]() English mathematician Isaac Newton (1643–1727) coined the word spectrum (Latin for "appearance") in his 1671 book "Opticks." He divided the spectrum into seven sections-red, orange, yellow, green, blue, indigo, and violet-in keeping with the Greek sophists, to connect the colors to days of the week, musical notes, and the known objects of the solar system. If you want a number, it's around 445 nanometers, but it doesn't appear on most spectra. There is no wavelength assigned to indigo.
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