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  2. Byzantine calendar - Wikipedia

    en.wikipedia.org/wiki/Byzantine_calendar

    The tabular Byzantine calendar is used to calculate the date of Easter. It dates back to AD 284, when the new moon fell on the fifth epagemonal day of the Alexandrian calendar (28 August). Eusebius (vii.32) recounts that Anatolius of Laodicea was the first to arrange the 19-years cycle (when the new moon returns to the same Julian date) for ...

  3. Ab urbe condita - Wikipedia

    en.wikipedia.org/wiki/Ab_urbe_condita

    Astronomical Year 0 754: AD 1: Approximate birth date of Jesus, approximated by Dionysius Exiguus in AD 525 (AUC 1278) 1000: AD 247: 1,000th Anniversary of the City of Rome 1037: AD 284: Diocletian became Roman emperor, starting the Dominate: 1229: AD 476: Fall of the Western Roman Empire to the armies of Odoacer: 1246: AD 493: Establishment of ...

  4. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.

  5. Calendar era - Wikipedia

    en.wikipedia.org/wiki/Calendar_era

    Coincidentally, this is the same as the Juche era used in North Korea, the year of the birth of its founder Kim Il-Sung. The Era Fascista 'Fascist Era' was instituted by the Italian Fascists and used Roman numerals to denote the number of years since the March on Rome in 1922. Therefore, 1934, for example, was XII E.F. (era fascista).

  6. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    Roman dates were counted inclusively forward to the next one of three principal days within each month: [54] Kalends (Kalendae or Kal.), the 1st day of each month [54] Nones (Nonae or Non.), the 7th day of "full months" [55] [f] and 5th day of hollow ones, [54] 8 days—i.e. the ninth day—before the Ides in every month

  7. 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 ...

  8. Birth registration in ancient Rome - Wikipedia

    en.wikipedia.org/wiki/Birth_registration_in...

    Birth certificates for Roman citizens were introduced during the reign of Augustus (27 BC–14 AD). Until the time of Alexander Severus (222–235 AD), it was required that these documents be written in Latin as a marker of "Romanness" (Romanitas). [1] There are 21 extant birth registration documents of Roman citizens. [2]

  9. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The corresponding date in the Gregorian calendar is 9 February 1649, the date by which his contemporaries in some parts of continental Europe would have recorded his execution. The O.S./N.S. designation is particularly relevant for dates which fall between the start of the "historical year" (1 January) and the legal start date, where different.