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  1. The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.

    • The original goal of the Gregorian calendar was to change the date of Easter. In 1582, when Pope Gregory XIII introduced his Gregorian calendar, Europe adhered to the Julian calendar, first implemented by Julius Caesar in 46 B.C.
    • Leap years don’t really occur every four years in the Gregorian calendar. The Julian calendar included an extra day in February every four years. But Aloysus Lilius, the Italian scientist who developed the system Pope Gregory would unveil in 1582, realized that the addition of so many days made the calendar slightly too long.
    • The Gregorian calendar differs from the solar year by 26 seconds per year. Despite Lilius’ ingenious method for syncing the calendar with the seasons, his system is still off by 26 seconds.
    • Some Protestants viewed the Gregorian calendar as a Catholic plot. Though Pope Gregory’s papal bull reforming the calendar had no power beyond the Catholic Church, Catholic countries—including Spain, Portugal and Italy—swiftly adopted the new system for their civil affairs.
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  3. Eventually, non-Catholic countries did begin to adopt the Gregorian calendar. The Protestant regions of Germany and the Netherlands switched in the 17th century. Great Britain and the territories of the British Empire followed suit in 1752, spreading the Gregorian calendar around the globe.

    • The Editors of Encyclopaedia Britannica
  4. Sep 27, 2019 · The Gregorian calendar has become the standard for measuring the progression of time since Pope Gregory XIII first introduced it in the year 1582. His papal influence let it spread to Italy, Spain, France, and other Catholic countries before becoming the most widely used calendar standard.

  5. Mar 6, 2017 · 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.

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