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A year zero does not exist in the Anno Domini (AD) calendar year system commonly used to number years in the Gregorian calendar (nor in its predecessor, the Julian calendar); in this system, the year 1 BC is followed directly by year AD 1 (which is the year of the epoch of the era).
The first day of "Year Zero" was declared by the Khmer Rouge on 17 April 1975 upon their takeover of Cambodia in order to signify a rebirth of Cambodian history. [2] [better source needed] Adopting the term as an analogy to the "Year One" of the French Revolutionary Calendar, [3] [better source needed] Year Zero was effectually an attempt by the Khmer Rouge to erase history and reset Cambodian ...
Bede and later historians did not enumerate any year as zero (nulla in Latin; see Year zero); therefore the year preceding AD 1 is 1 BC. In this system the year 1 BC is a leap year (likewise in the proleptic Julian calendar). Mathematically, it is more convenient to include a year 0 and represent earlier years as negative numbers for the ...
There is no year zero in this scheme; thus the year AD 1 immediately follows the year 1 BC. This dating system was devised in 525 by Dionysius Exiguus but was not widely used until the 9th century. [4] [5] (Modern scholars believe that the actual date of birth of Jesus was about 5 BC.)
For example, a date Anno Domini (AD) 2025 becomes Anno Lucis (AL) 6025. [1] This calendar era, which would designate 4001 BC as 'year zero', was adopted in the 18th century as a simplification of the Anno Mundi era dating system used in the Hebrew calendar and borrowing from other ideas of that time regarding the year of creation.
Thus, the year before the year +1 is the year zero, and the year preceding the latter is the year −1. The year which historians call 585 B.C. is actually the year −584. The astronomical counting of the negative years is the only one suitable for arithmetical purpose.
[30] [31] In 1835, in his book Living Oracles, Alexander Campbell, wrote: "The vulgar Era, or Anno Domini; the fourth year of Jesus Christ, the first of which was but eight days", [32] and also refers to the common era as a synonym for vulgar era with "the fact that our Lord was born on the 4th year before the vulgar era, called Anno Domini ...
Because there is no year zero in the Gregorian calendar, this period is one of two "1-to-9" decade-like timespans that contain only nine years, along with the 0s BC. The Anno Domini (AD) calendar era which numbers these years 1-9 was devised by Dionysius Exiguus in 525, and became widely used in Christian Europe in the 9th century.