First, the Julian calendar assumed incorrectly that the average solar year is exactly 365.25 days long, an overestimate of a little under one day per century, and thus has a leap year every four years without exception. ![]() There were two reasons to establish the Gregorian calendar. For example, the years 1700, 1800, and 1900 are not leap years, but the year 2000 is. ![]() The principal change was to space leap years differently so as to make the average calendar year 365.2425 days long, more closely approximating the 365.2422-day 'tropical' or 'solar' year that is determined by the Earth's revolution around the Sun.Įvery year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. It was introduced on February 24 with a papal bull, and went into effect in October 1582 by Pope Gregory XIII as a modification of, and replacement for, the Julian calendar. The Gregorian calendar is the calendar used in most parts of the world. ![]() ![]() 2023 in various calendars Gregorian calendar Not to be confused with Georgian calendar.
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