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  2. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).

  3. Mixed radix - Wikipedia

    en.wikipedia.org/wiki/Mixed_radix

    A standard form for dates is 2021-04-10 16:31:15, which would be a mixed radix number by this definition, with the consideration that the quantities of days vary both per month, and with leap years. One proposed calendar instead uses base 13 months, quaternary weeks, and septenary days. A mixed radix numeral system is often best expressed with ...

  4. 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 ...

  5. Military designation of days and hours - Wikipedia

    en.wikipedia.org/wiki/Military_designation_of...

    The effective time of announcement by the U.S. Secretary of Defense to the Military Departments of a decision to mobilize Reserve units. (US) G-Day The unnamed day on which an order, normally national, is given to deploy a unit. (NATO) H-Hour

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  7. Julian year (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Julian_year_(astronomy)

    The Julian day number is a simplified time-keeping system originally intended to ease calculation with historical dates which involve a diversity of local, idiosyncratic calendars. It was adopted by astronomers in the mid-1800s, and identifies each date as the integer number of days that have elapsed since a reference date ( "epoch" ), chosen ...

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  9. On Today's Date: First Northeast Snowstorm Of A ... - AOL

    www.aol.com/news/todays-date-first-northeast...

    Northeast snowfall along the Interstate 95 Boston to Washington, D.C. corridor has been lacking in recent years. But on Dec. 19, 2009, 15 years ago today, the Northeast was in the midst of a major ...