September 20 is the 263rd day of the year (264th in leap years A leap year is a year containing one or more extra days (or, in the case of lunisolar calendars, an extra month) in order to keep the calendar year synchronized with the astronomical or seasonal year) in the Gregorian calendar The Gregorian calendar is the internationally accepted civil calendar. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom the calendar was named, on 24 February 1582 by the papal bull Inter gravissimas. There are 102 days remaining until the end of the year.
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