Show Math related events from this day in history:

43 B.C.

The first day of the first year of the Julian calendar. It remained in effect until October 4, 1582 (q.v.) The previous year, "the last year of confusion," was the longest year on record---it contained 445 days.

1865

This is Julian day 1 and begins at noon Greenwich or Universal Time (U.T.). It provides a convenient way to keep track of the number of days between events. Noon, January 1, 1984, begins Julian Day 2,445,336. For the use of the Chinese remainder theorem in determining this date, see American Journal of Physics, 49 (1981), 658-661.

1806

France adopts the Gregorian calendar for the second time.