A report on Gregorian calendar and Calendar era

An image showing which century years are leap years in the Gregorian calendar
Lunario Novo, Secondo la Nuova Riforma della Correttione del l'Anno Riformato da N.S. Gregorio XIII, printed in Rome by Vincenzo Accolti in 1582, one of the first printed editions of the new calendar.
Memorial plaque to John Etty in All Saints' Church, North Street, York, recording his date of death as 28 January 170 8⁄9
The knuckle mnemonic for the days of the months of the year
Gregorian calendar seasons difference

For example, it is the year 2022 as per the Gregorian calendar, which numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras).

- Calendar era

A calendar date is fully specified by the year (numbered according to a calendar era, in this case Anno Domini or Common Era), the month (identified by name or number), and the day of the month (numbered sequentially starting from 1).

- Gregorian calendar
An image showing which century years are leap years in the Gregorian calendar

5 related topics with Alpha

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Anno Domini inscription at Klagenfurt Cathedral, Austria

Anno Domini

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Anno Domini inscription at Klagenfurt Cathedral, Austria
Statue of Charlemagne by Agostino Cornacchini (1725), at St. Peter's Basilica, Vatican City. Charlemagne promoted the usage of the Anno Domini epoch throughout the Carolingian Empire.

The terms anno Domini (AD) and before Christ (BC) are used to label or number years in the Julian and Gregorian calendars.

This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus, AD counting years from the start of this epoch and BC denoting years before the start of the era.

Johannes Kepler first used "Vulgar Era" to distinguish dates on the Christian calendar from the regnal year typically used in national law.

Common Era

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Johannes Kepler first used "Vulgar Era" to distinguish dates on the Christian calendar from the regnal year typically used in national law.

Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era.

The Tusculum portrait of Julius Caesar

Julian calendar

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Reform of the Roman calendar.

Reform of the Roman calendar.

The Tusculum portrait of Julius Caesar
This is a visual example of the official date change from the Julian calendar to the Gregorian.
Russian icon of the Theophany (the baptism of Jesus by John the Baptist) (6 January), the highest-ranked feast which occurs on the fixed cycle of the Eastern Orthodox liturgical calendar.

Worldwide adoption of this revised calendar, which became known as the Gregorian calendar, took place over the subsequent centuries, first in Catholic countries and subsequently in Protestant countries of the Western Christian world.

In 537, Justinian required that henceforth the date must include the name of the emperor and his regnal year, in addition to the indiction and the consul, while also allowing the use of local eras.

Hijri year

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The Hijri year (سَنة هِجْريّة) or era (التقويم الهجري at-taqwīm al-hijrī) is the era used in the Islamic lunar calendar.

Consequently its New Years Day occurs ten days earlier each year relative to the Gregorian calendar.

Holocene calendar

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The Holocene calendar, also known as the Holocene Era or Human Era (HE), is a year numbering system that adds exactly 10,000 years to the currently dominant (AD/BC or CE/BCE) numbering scheme, placing its first year near the beginning of the Holocene geological epoch and the Neolithic Revolution, when humans shifted from a hunter-gatherer lifestyle to agriculture and fixed settlements.

Conversion from Julian or Gregorian calendar years to the Human Era can be achieved by adding 10,000 to the AD/CE year.