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On This Day

Date

Year

Month

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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