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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 ...
As of October 2019, the BBC News style guide has entries for AD and BC, but not for CE or BCE. [57] The style guide for The Guardian says, under the entry for CE/BCE: "some people prefer CE (common era, current era, or Christian era) and BCE (before common era, etc.) to AD and BC, which, however, remain our style". [58]
The year 1 BC/BCE is numbered 0, the year 2 BC is numbered −1, and in general the year n BC/BCE is numbered "−(n − 1)" [1] (a negative number equal to 1 − n). The numbers of AD/CE years are not changed and are written with either no sign or a positive sign; thus in general n AD/CE is simply n or +n. [1]
Astronomical year numbering situates its year 0 with 1 BC, and counts negative years from 2 BC backward (−1 backward), so 100 BC is −99. The human era, also named Holocene era, proposed by Cesare Emiliani adds 10,000 to AD years, so that AD 1 would be the year 10,001. [15] Anno Lucis of Freemasonry adds 4000 years to the AD year.
11th millennium BC · 11,000–10,001 BC 10th millennium BC · 10,000–9001 BC 9th millennium BC · 9000–8001 BC 8th millennium BC · 8000–7001 BC 7th millennium BC · 7000–6001 BC 6th millennium BC · 6000–5001 BC 5th millennium BC · 5000–4001 BC 4th millennium BC · 4000–3001 BC 40th century BC: 39th century BC: 38th century BC ...
The central darker part of the normal curve is the range within one standard deviation of the mean; the lighter grey area shows the range within two standard deviations of the mean. The output is along the bottom axis; it is a trimodal graph, with peaks at around 710 AD, 740 AD, and 760 AD.
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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).