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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.

  2. The Gregorian Calendar is the most widely used calendar in the world today. It is the calendar used in the international standard for Representation of dates and times: ISO 8601:2004. It is a solar calendar based on a 365-day common year divided into 12 months of irregular lengths. 11 of the months have either 30 or 31 days, while the second ...

  3. But it took another two decades to find a suitable fix and put it into place. After years of consultation and research, Pope Gregory XIII signed a papal bull in February 1582 promulgating the reformed calendar that came to be known as the Gregorian calendar.

    • The Editors of Encyclopaedia Britannica
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  5. Dec 7, 2020 · The Gregorian calendar was instituted by Pope Gregory XIII in 1582 and quickly adopted by much of Catholic, but not Protestant, Europe. The reform altered the Julian, or Old Style, system of leap years and, by removing ten days from October 1582, adjusted the timing of the Easter observance so that it better coincided with the spring season.

  6. Because the Gregorian calendar used a more accurate value for the tropical year than the Julian calendar and achieved this by omitting most centennial leap years, Clavius decided that, when the cycle of epacts reached an ordinary centennial year, the number of the epact should be reduced by one; this reduction became known as the solar correction.

  7. 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 ...

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