Template:Today in Math History for December 21

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December 21, 1754 Louis Bertrand Castel gives a demonstration of his "ocular harpsichord,"which shows a correspondence between colors and musical tones.
December 21, 1807 Joseph Fourier presents his work on what would eventually be known as the "Fourier series" to a committee at the Paris Institute.
December 21, 2012 marks the end of a great cycle of the Mayan calendar, a fact that has been misunderstood as an apocalyptical prophecy.

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