2021 wikipedia gregorian calendar

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 ...

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2021 (MMXXI) was a common year starting on Friday of the Gregorian calendar, the 2021st year of the Common Era (CE) and Anno Domini (AD) designations.

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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.

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Gregorian calendar. The Gregorian calendar is the calendar used in most of the world.[1] It was introduced in October 1582 by Pope Gregory ...

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The current rule is 1 leap year every 4 years except on years that are divisible by 100 and not 400 (that's why 2000 was a leap year but ...

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Gregorian calendar, internationally accepted civil calendar. In more languages Spanish calendario gregoriano calendario que toma como referencia el movimiento ...

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Determining the dates of change from the Julian calendar to the Gregorian calendar is not as easy as it seems it should be. Countries, and sometimes areas ...

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The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction ...

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The Gregorian calendar is a solar calendar and the most widely used calendar in the world. It was created towards the end of the 16th ...

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Astronomers have used the Julian period to assign a unique number to every day since 1 January 4713 BC. This is the so-called Julian Day (JD) or Julian Day ...

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