Calendar era

Under epoch ( gr ̓Εποχή = breakpoint (time ) section ) is understood in the chronology of the date of commencement of an era ( year count).

Basics

Time of epoch is usually a single day ( Epochentag ), which reflects a historical or fictional event, such as the beginning of a kingdom, the establishment of a city or the creation of the world. Only modern time systems also specify the time of the epoch in historical datings it is usually very time-consuming to determine the exact time ( beginning of the day and hour counting system, local time).

The individual calendar systems go in different ways with the data before their period to: Calendar, who expected since the supposed creation of the world, were not initially proleptically, that is, they knew no data before the epoch. In the Gregorian calendar reference is made to the data of the proleptic Julian calendar: n Before 1 January 1 AD is here December 31 1 v. Chr established principle on periods all dynastic calendar systems at the commencement of a new ruler. or dynasty start a new years count.

A calendar can be used with different eras. Thus, a different era is considered as in North Korea than in most other countries that use the Gregorian calendar. Conversely, an epoch and the corresponding era are also used by different calendars (such as Nativity)

Some eras in chronological order

In addition to important eras of historical chronology and the calendar being some eras of astronomical chronology are incorporated, and in particular the Julian date JD, which provides the basis of the conversion of calendar systems, as well as contemporary dating epochs of data processing

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