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The Gregorian calendar is proleptic before 1582 (calculated backwards on the same basis, for years before 1582), and the difference between Gregorian and Julian calendar dates increases by three days every four centuries (all date ranges are inclusive).
23 paź 2024 · Gregorian calendar, 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).
Pope Gregory XIII issued a papal bull, "Inter Gravissimus" on February 24, 1582 that established the Gregorian calendar as the new and official calendar of the Catholic world. Since the Julian calendar had fallen ten days behind over the centuries, Pope Gregory XIII designated that October 4, 1582 would be officially followed by October 15, 1582.
18 paź 2024 · What is the Gregorian calendar? Why was the Gregorian calendar created? When was the Gregorian calendar adopted?
Great Britain and the territories of the British Empire followed suit in 1752, spreading the Gregorian calendar around the globe. In 1582 Pope Gregory XIII introduced a more accurate calendar. But switching over wasn’t easy.
The Gregorian calendar was first adopted in Italy, Poland, Portugal, and Spain in 1582 when ten days were dropped. It then took centuries for the new system to spread to all corners of the planet: The final country to adopt it was Turkey in 1927.
The Gregorian calendar was decreed in 1582 by the papal bull Inter gravissimas by Pope Gregory XIII, to correct an error in the Julian calendar that was causing an erroneous calculation of the date of Easter.
