why is our calendar called the gregorian calendar
Gregorian calendar The Gregorian calendar is internationally the most widely used civil calendar.[1][2][Note 1] It is named after Pope Gregory XIII, who introduced it in October 1582.
Paris Peace Accords
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Gregorian calendar The Gregorian calendar is the most widely used civil calendar in the world.[1][2][Note 1] It is named after Pope Gregory XIII, who introduced it in October 1582. The calendar spaces leap years to make the average year 365.2425 days long, approximating the 365.2422 day tropical year that is determined by the Earth's rotation around the Sun. The rule for leap years is as follows: