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  2. Common Era - Wikipedia

    en.wikipedia.org/wiki/Common_Era

    Some publications have transitioned to using it exclusively. For example, the 2007 World Almanac was the first edition to switch to BCE/CE, ending a period of 138 years in which the traditional BC/AD dating notation was used. BCE/CE is used by the College Board in its history tests, [59] and by the Norton Anthology of English Literature. Others ...

  3. Calendar era - Wikipedia

    en.wikipedia.org/wiki/Calendar_era

    Many countries switched to using 1 January as the start of the numbered year at the same time as they switched from the Julian calendar to the Gregorian calendar, but others switched earlier or later. B.C. (or BC) – meaning "Before Christ". Used for years before AD 1, counting backwards so the year n BC is n years before AD 1.

  4. Before Present - Wikipedia

    en.wikipedia.org/wiki/Before_Present

    The BP scale is sometimes used for dates established by means other than radiocarbon dating, such as stratigraphy. [5] [6] This usage differs from the recommendation by van der Plicht & Hogg, [7] followed by the Quaternary Science Reviews, [8] [9] both of which requested that publications should use the unit "a" (for "annum", Latin for "year") and reserve the term "BP" for radiocarbon estimations.

  5. List of decades, centuries, and millennia - Wikipedia

    en.wikipedia.org/wiki/List_of_decades,_centuries...

    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 ...

  6. Anno Domini - Wikipedia

    en.wikipedia.org/wiki/Anno_Domini

    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 ...

  7. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    Early Iron Age (c. 1050 BC – 776 BC) – part of the Greek Dark Ages; Classical antiquity (776 BC – 476 AD) Archaic Greece (776 BC – 480 BC) – begins with the First Olympiad, traditionally dated 776 BC; Classical Greece (480 BC – 338 BC) Macedonian era (338 BC – 323 BC) Hellenistic Greece (323 BC – 146 BC) Late Roman Republic (147 ...

  8. 1st century BC - Wikipedia

    en.wikipedia.org/wiki/1st_century_BC

    The 1st century BC, also known as the last century BC and the last century BCE, started on the first day of 100 BC and ended on the last day of 1 BC. The AD/BC notation does not use a year zero; however, astronomical year numbering does use a zero, as well as a minus sign, so "2 BC" is equal to "year –1". 1st century AD (Anno Domini) follows.

  9. Astronomical year numbering - Wikipedia

    en.wikipedia.org/wiki/Astronomical_year_numbering

    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]