Gregorian Calendar:

The Julian calendar was imprecise and the difference between the tropical year and the Julian year was 0,078 days per year, that make a difference of three days every 400 years. To compensate this shift it has been decided in 1582, by Pope Gregoire XIII, and in agreement with the scientific authorities of the time, to make Friday 15 October 1582 be the following day of Thursday 4 October. The new calendar, the one under our days was named Gregorian calendar.

See also:

Calendar

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