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On February 24, 1582, Pope Gregory XIII introduced a new calendar for use in the Catholic Church. Today, the Gregorian calendar is the most widely used calendar in the world.
 
The Gregorian calendar is a 400-year cycle where each year is about 365.2425 days. The calendar is notable for its “leap years.” Leap years are an extra day in February. Leap years are added every four years, in years divisible by 100 and by 400. So, 1900 was not a leap year, because it is not evenly divisible by 400. The next 4-year cycle not being a leap year will be the year 2100.
 
Other calendars are more accurate than the Gregorian calendar. The Persian calendar, the official calendar of Iran and Afghanistan, requires fewer adjustments (such as leap years). Regardless, the Gregorian calendar remains the standard civil calendar in the world today, used by such international organizations as the United Nations.
accurate
Adjective

exact.

adjustment
Noun

device for bringing something into general compliance or use.

Catholic
Adjective

having to do with the Christian denomination with the Pope as its leader.

civil
Adjective

having to do with the ordinary life of a citizen, as differentiated from military, legal, or church-related concerns.

Noun

unit made up of governments or groups in different countries, usually for a specific purpose.

landlord
Noun

owner of an area of land where others occupy space and pay rent.

notable
Adjective

important or impressive.

Persia
Noun

empire that dominated Mesopotamia from about 550 to 330 BCE. Most of the ancient Persian empire is in modern-day Iran.

pope
Noun

leader of the Catholic Church.

rent
Noun

payment for use of a piece of property for a certain amount of time, usually a month.

United Nations
Noun

international organization that works for peace, security and cooperation.

More Dates in History

February
MonTueWedThuFriSatSun
27 28 29 30 31 1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 1