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  2. 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 ...

  3. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    Starting in March, the sequence basically alternates 3, 2, 3, 2, 3, but every five months there are two 31-day months in a row (July–August and December–January). [1] The fraction 13/5 = 2.6 and the floor function have that effect; the denominator of 5 sets a period of 5 months.

  4. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    TJD was a 4-digit day count from MJD 40000, which was May 24, 1968, represented as a 14-bit binary number. Since this code was limited to four digits, TJD recycled to zero on MJD 50000, or October 10, 1995, "which gives a long ambiguity period of 27.4 years". (NASA codes PB-1–PB-4 used a 3-digit day-of-year count.) Only whole days are ...

  5. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

  6. 3 BC - Wikipedia

    en.wikipedia.org/wiki/3_BC

    3 BC in various calendars; Gregorian calendar: 3 BC III BC: Ab urbe condita: 751: Ancient Greek era: 194th Olympiad, year 2: Assyrian calendar: 4748: Balinese saka calendar: N/A: Bengali calendar: −596 – −595: Berber calendar: 948: Buddhist calendar: 542: Burmese calendar: −640: Byzantine calendar: 5506–5507: Chinese calendar ...

  7. Babylonian mathematics - Wikipedia

    en.wikipedia.org/wiki/Babylonian_mathematics

    Clay tablets from c. 2000 BC include the exercise "Given an interest rate of 1/60 per month (no compounding), compute the doubling time." This yields an annual interest rate of 12/60 = 20%, and hence a doubling time of 100% growth/20% growth per year = 5 years. [17] [18]

  8. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    A Gregorian year, which takes into account the 100 vs. 400 leap year exception rule of the Gregorian calendar, is 365.2425 days (the average length of a year over a 400–year cycle), resulting in 0.1 years being a period of 36.52425 days (3 155 695.2 seconds; 36 days, 12 hours, 34 minutes, 55.2 seconds).

  9. Wikipedia:Age calculation templates - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Age_calculation...

    Some of these templates can be complex, and will greatly add to the loading time of a page if used many times. For example, in an article like list of Prime Ministers of Canada by time in office , the template is only used for the incumbent prime minister, and fixed numbers are used for all past prime ministers.