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For computational reasons, astronomical year numbering and the ISO 8601 standard designate years so that AD 1 = year 1, 1 BC = year 0, 2 BC = year −1, etc. [c] In common usage, ancient dates are expressed in the Julian calendar, but ISO 8601 uses the Gregorian calendar and astronomers may use a variety of time scales depending on the ...
In Czech, the "n. l." (našeho letopočtu which translates as of our year count) and "př. n. l." or "před n. l." (před naším letopočtem meaning before our year count) is used, always after the year number. The direct translation of AD (léta Páně, abbreviated as L. P.) or BC (před Kristem, abbreviated as př. Kr.) is seen as archaic. [88]
Astronomical year numbering is based on AD/CE year numbering, but follows normal decimal integer numbering more strictly. Thus, it has a year 0; the years before that are designated with negative numbers and the years after that are designated with positive numbers. [1]
AD anno Domini "in the year of the Lord" Used to label or number years in the Julian and Gregorian calendars. The AD or the Christian calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years after the start of this epoch, and BC counting years before the start of the epoch.
This is a directory of abbreviations used on Wikipedia for various pages, processes, policies, and proposals. For the guideline on the use of abbreviations in articles, see Wikipedia:Manual of Style/Abbreviations .
BCE and CE or BC and AD are written in upper case, unspaced, without a full stop (period), and separated from the numeric year by a space (5 BC, not 5BC). It is advisable to use a non-breaking space. AD appears before or after a year (AD 106, 106 AD); BCE, CE, and BC always appear after (106 CE, 3700 BCE, 3700 BC).
See calendar and list of calendars for other groupings of years. See history , history by period , and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang , Geologic time scale , Timeline of evolution , and Logarithmic timeline .
The following list contains a selection from the Latin abbreviations that occur in the writings and inscriptions of the Romans. [ 1 ] [ 2 ] A few other non-classical Latin abbreviations are added. Contents: