Nikolai Ivanovich Lobachevsky

Nikolai Ivanovich Lobachevsky (Никола́й Ива́нович Лобаче́вский) (December 1 1792–February 24 1856 (N.S.); November 20 1792–February 12 1856 (O.S.))) was a Russian mathematician.

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Lobachevsky was born in Nizhny Novgorod, Russia. His parents were Ivan Maksimovich Lobachevsky, a clerk in a landsurveying office, and Praskovia Alexandrovna Lobachevskaya. In 1800, his father died and his mother moved to Kazan. In Kazan, Nikolai Ivanovich Lobachevsky attended Kazan Gymnasium, graduating in 1807 and then Kazan University which was founded just three years earlier, in 1804.

1792: 1792 was a leap year starting on Sunday (see link for calendar)....

February 24: February 24 is the 55th day of the year in the Gregorian Calendar. There are 310 days remaining, 311 in leap years. By Roman custom February 24 is the day added to a leap year, and the occurrence of February 29 is merely a consequence of this....

1856: 1856 was a leap year starting on Tuesday (see link for calendar)....

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