Gregorian Calendar

Introduced in 1582 by Pope Gregory the 13th, this calendar modifies the Julian calendar for greater precision, decreeing that century years such as 1900 are not leap years, except if the number of centuries is divisible by 4 (e.g. 2000).

Civil Year

A year as measured by the conventional calendar, equal to 365 days in most years but 366 days in a leap year.

See also: Julian Calendar, Julian Day.

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Subjects: Physics