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  1. Dictionary
    Gre·go·ri·an cal·en·dar
    /ɡrəˌɡôrēən ˈkaləndər/

    noun

    • 1. the calendar introduced in 1582 by Pope Gregory XIII, as a modification of the Julian calendar.

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  2. The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  3. 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).

    • The Editors of Encyclopaedia Britannica
  4. 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 ...

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  6. Sep 15, 2023 · Let’s learn what the Gregorian calendar is, how it became the most common calendar, which countries use or don't use it, and what happened during the years of “double calendars.” We’ll even teach you how to figure out if your ancestors used the same calendar we do!

  7. The Gregorian calendar, also known as the Western Calendar, is the most used calendar around the world. It was first used in 1582, as an evolution of what already existed, enabling people to understand the year and season with increasing accuracy.

  8. The Gregorian calendar is the calendar that is used throughout most of the world. It began being used in 1582. It replaced the previous Julian calendar because the Julian calendar had an error: it added a leap year (with an extra day every four years) with no exceptions.

  9. Apr 25, 2017 · Today, the Julian calendar is approximately 13 days behind the Gregorian date. The Gregorian calendar is not 100% accurate, either and actually has a 26-second yearly difference when compared with the solar year. By the year 4909, the calendar will be 1 day ahead of the solar year.

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