Gregorian calendar The Gregorian calendar is the calendar that is used throughout most of the world. It began being used in 1582. It replaced the previous Julian calendar because the Julian calendar had an error: it added a leap year (with an extra day every four years) with no exceptions. Gregorian Calendar : Understand all the aspects of the Gregorian Calendar that is used by each one of us every single day. Learn everything from date, time to days! The Gregorian calendar is the solar dating system now in general use . It was proclaimed in 1582 by Pope Gregory XIII as a reform of the Julian calendar. The Gregorian calendar differs from the Julian only in that no century year is a leap year unless it is exactly divisible by 400 (e.g., 2000). While Julius Caesar's Julian calendar proved useful, it was inaccurate. Learn all about the change to the Gregorian calendar of 1582, from your About.com Guide to Geography.
