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  2. Year zero - Wikipedia

    en.wikipedia.org/wiki/Year_zero

    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).

  3. Astronomical year numbering - Wikipedia

    en.wikipedia.org/wiki/Astronomical_year_numbering

    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.

  4. Anno Domini - Wikipedia

    en.wikipedia.org/wiki/Anno_Domini

    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.)

  5. 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.

  6. Proleptic Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Proleptic_Gregorian_calendar

    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 ...

  7. Before Present - Wikipedia

    en.wikipedia.org/wiki/Before_Present

    2251 BC: 4200 BP Beginning of the Meghalayan age, the current and latest of the three stages in the Holocene era. [22] [23] 45 BC: 1994 BP Introduction of the Julian calendar: 1 BC: 1950 BP Year zero in ISO 8601: AD 1: 1949 BP Beginning of the Common Era and Anno Domini, from the estimate by Dionysius of the Incarnation of Jesus: 1582 368 BP

  8. Anno Lucis - Wikipedia

    en.wikipedia.org/wiki/Anno_Lucis

    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.

  9. 0s BC - Wikipedia

    en.wikipedia.org/wiki/0s_BC

    The 0s BC is the period between 9 BC and 1 BC, the last nine years of the before Christ era. It is one of two "0-to-9" decade -like timespans that contain nine years, along with the 0s . This is a list of events occurring in the 0s BC ordered by year.