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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 days of the year in the Gregorian calendar are divided into 7-day weeks, and the weeks are numbered 1 to 52 or 53. The international standard is to start the week on Monday. However, several countries, including the US and Canada, count Sunday as the first day of the week.
The most surreal part of implementing the new calendar came in October 1582, when 10 days were dropped from the calendar to bring the vernal equinox from March 11 back to March 21. The church had chosen October to avoid skipping any major Christian festivals.
- The Editors of Encyclopaedia Britannica
Mar 12, 2024 · The adoption of the Gregorian calendar greatly improved the accuracy of timekeeping and calendar dates, aligning them more closely with the astronomical year and the seasons. It also standardized the calculation of dates like Easter.
Practically speaking, this means that Easter may not be celebrated before April 3 (Gregorian), which had been March 21--the date of the vernal equinox--at the time of the First Ecumenical...
Oct 6, 2019 · The delay of the calendar compared to the seasons (e.g. the beginning of spring) was corrected in 1582 by omitting ten calendar days. The situation at the time of the Council of Nicaea in 325 was restored, since at this Council for the first time decisions about the date of Easter were made.
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Jun 18, 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).
