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  2. Year 2000 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2000_problem

    While using 3-digit years and 3-digit dates within that year was used by some, others chose to use the number of days since a fixed date, such as 1 January 1900. [27] Inaction was not an option, and risked major failure. Embedded systems with similar date logic were expected to malfunction and cause utilities and other crucial infrastructure to ...

  3. Date of Easter - Wikipedia

    en.wikipedia.org/wiki/Date_of_Easter

    There are 76 × 6 = 456 usual nominal 30-day lunar months and the same number of usual nominal 29-day months, but with 19 of these lengthened by a day on leap days, plus 24 intercalated months of 30 days and four intercalated months of 29 days. Since this is longer than the true length of a synodic month, about 29.53059 days, the calculated ...

  4. United States Electoral College - Wikipedia

    en.wikipedia.org/wiki/United_States_Electoral...

    A state's number of electors equals the number of representatives plus two electors for the senators the state has in the United States Congress. [ 117 ] [ 118 ] Each state is entitled to at least one representative, the remaining number of representatives per state is apportioned based on their respective populations, determined every ten ...

  5. Froude number - Wikipedia

    en.wikipedia.org/wiki/Froude_number

    In marine hydrodynamic applications, the Froude number is usually referenced with the notation Fn and is defined as: [8] =, where u is the relative flow velocity between the sea and ship, g is in particular the acceleration due to gravity, and L is the length of the ship at the water line level, or L wl in some notations.

  6. List of Formula One seasons - Wikipedia

    en.wikipedia.org/wiki/List_of_Formula_One_seasons

    A total of 74 World Championship seasons of Formula One (F1) have been run. [1] F1 is the highest form of open wheeled auto racing series regulated by the Fédération Internationale de l'Automobile (FIA), motorsport's world governing body. [2]

  7. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    The reason that the formula differs between calendars is that the Julian calendar does not have a separate rule for leap centuries and is offset from the Gregorian calendar by a fixed number of days each century.

  8. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    According to Thurston 1909, p. 109 dominical letters are:. a device adopted from the Romans by the old chronologers to aid them in finding the day of the week corresponding to any given date, and indirectly to facilitate the adjustment of the 'Proprium de Tempore' to the 'Proprium Sanctorum' when constructing the ecclesiastical calendar for any year.

  9. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.

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