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  2. 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.

  3. Anno Domini - Wikipedia

    en.wikipedia.org/wiki/Anno_Domini

    The terms anno Domini ( AD) and before Christ ( BC) [ a] are used when designating years in the Julian and Gregorian calendars. The term anno Domini is Medieval Latin and means "in the year of the Lord" [ 1] but is often presented using "our Lord" instead of "the Lord", [ 2][ 3] taken from the full original phrase " anno Domini nostri Jesu ...

  4. Before Present - Wikipedia

    en.wikipedia.org/wiki/Before_Present

    Conversion from Gregorian calendar years to Before Present years is by starting with the 1950-01-01 epoch of the Gregorian calendar and increasing the BP year count with each year into the past from that Gregorian date. For example, 1000 BP corresponds to 950 AD, 1949 BP corresponds to 1 AD, 1950 BP corresponds to 1 BC, 2000 BP corresponds to ...

  5. Common Era - Wikipedia

    en.wikipedia.org/wiki/Common_Era

    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, [ 55 ] and by the Norton Anthology of English Literature .

  6. List of archaeological periods (North America) - Wikipedia

    en.wikipedia.org/wiki/List_of_archaeological...

    by Time Period Early Archaic 8000 – 6000 BCE Plano cultures: 9,000 – 5,000 BCE Paleo-Arctic tradition: 8000 – 5000 BCE Maritime Archaic: Red Paint People: 3000 – 1000 BCE Middle Archaic 6000 – 3000 BCE Chihuahua tradition: c. 6000 BCE – c. 250 CE Watson Brake and Lower Mississippi Valley sites c. 3500 – 2800 BCE Late Archaic 3000 ...

  7. Geologic time scale - Wikipedia

    en.wikipedia.org/wiki/Geologic_time_scale

    The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [ 5] It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or ...

  8. Proleptic Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Proleptic_Gregorian_calendar

    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 specific purpose of facilitating the calculation of the number of years between a negative (BC) year and a positive (AD) year.

  9. Anno Mundi - Wikipedia

    en.wikipedia.org/wiki/Anno_Mundi

    Anno Mundi (from Latin "in the year of the world"; Hebrew: לבריאת העולם, romanized : Livryat haOlam, lit. 'to the creation of the world'), abbreviated as AM or A.M., or Year After Creation, [ 1] is a calendar era based on the biblical accounts of the creation of the world and subsequent history. Two such calendar eras have seen ...