2021 wikipedia gregoriaanse kalender: Jaaroverzicht

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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