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On This Day

  • 9-22-1602

    Jesus' birthdate disputed. The astronomer Michael Mastlin, Kepler's teacher, on the basis of chronological research put Jesus' birth more than four years before the conventional date of A.D. 1. This date is now generally accepted.

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    Michael Maestlin
  • 9-22-1703

    Vincenzo Viviani died in Florence, Italy. Galileo's last student, the geometer wrote a life of Galileo and restored and published much ancient Greek mathematics.

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    Vincenzo Viviani
  • 9-22-1765

    Paolo Ruffini born in Valentano, Italy, which was then in the Papal States. Ruffini worked with permutation groups and proved that quintic polynomials are not, in general, solvable by radicals.

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    Paolo Ruffini

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