The Gregorian Calendar

The Gregorian calendar is the most widely used dating system in the world. It replaced the Julian calendar in 1582, following a decree by Pope Gregory XIII, after whom it is named. In the Julian system, an inaccuracy in the measurement of the solar year caused the calendar dates of the seasons to regress almost one day per century. By Gregory’s time, the Julian calendar was 10 days out of sync. To bring the vernal equinox—and thus Easter—back to its proper date, 10 days were dropped. Which ten? Discuss

Source: The Free Dictionary

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