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  2. Conversion between Julian and Gregorian calendars - Wikipedia

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

    If conversion takes you past a February 29 that exists only in the Julian calendar, then February 29 is counted in the difference. Years affected are those which divide by 100 without remainder but do not divide by 400 without remainder (e.g., 1900 and 2100 but not 2000).

  3. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The need to correct the calendar arose from the realisation that the correct figure for the number of days in a year is not 365.25 (365 days 6 hours) as assumed by the Julian calendar but slightly less (c. 365.242 days). The Julian calendar therefore has too many leap years.

  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. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    Previously used the Thai lunar calendar. The year numbering followed the Rattanakosin Era until 1912, when it was replaced by the Buddhist era; see Thai solar calendar. Turkey: Ottoman Empire: 1917 15 Feb 1 Mar 13 The year numbering followed the Rumi calendar until 1 Jan 1926, when the Anno Domini era was adopted. Uganda: British Empire: 1893 ...

  6. Generation time - Wikipedia

    en.wikipedia.org/wiki/Generation_time

    One may then define the generation time as the time it takes for the population to increase by a factor of . For example, in microbiology , a population of cells undergoing exponential growth by mitosis replaces each cell by two daughter cells, so that R 0 = 2 {\displaystyle \textstyle R_{0}=2} and T {\displaystyle T} is the population doubling ...

  7. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    [e] [f] Of these 400 years, 303 are regular years of 365 days and 97 are leap years of 366 days. A mean calendar year is ⁠365 + 97 / 400 ⁠ days = 365.2425 days, or 365 days, 5 hours, 49 minutes and 12 seconds. [g]

  8. Spanish era - Wikipedia

    en.wikipedia.org/wiki/Spanish_era

    The Spanish era (Latin: Æra Hispanica), sometimes called the era of Caesar, was a calendar era (year numbering system) commonly used in the states of the Iberian Peninsula from the 5th century until the 15th, when it was phased out in favour of the Anno Domini (AD) system. [1] The epoch (start date) of the Spanish era was 1 January 38 BC.

  9. 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 ...