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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.
Years AD are counted forward since that epoch and years BC are counted backward from the epoch. 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.
The two notation systems are numerically equivalent: "2025 CE" and "2025 AD" each describe the current year; "500 BCE" and "500 BC" are the same year. [ 1 ] [ 2 ] The expression can be traced back to 1615, when it first appears in a book by Johannes Kepler as the Latin : annus aerae nostrae vulgaris ( year of our common era ), [ 3 ] [ 4 ] and ...
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]
The "basic" format for year 0 is the four-digit form 0000, which equals the historical year 1 BC. Several "expanded" formats are possible: −0000 and +0000, as well as five- and six-digit versions. Earlier years are also negative four-, five- or six-digit years, which have an absolute value one
Using these times, 13,900 + 1,255 + 1,817 + 1,790 + 350 + 5,813 = 24,950 years, which counting back from Menes (3050 BC) fixes the creation at 28,000 BC. [10] George Syncellus preserved yet another set of figures for the predynastic "reign of the gods", 11,984 years for Gods and 2,646 for demigods producing 14,630 years, thus dating the ...
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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 ...