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  2. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    The equation of time describes the discrepancy between two kinds ... number of days past a specific date and time ... 0 to 2 π by subtracting 10 and 11 times 2 ...

  3. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    10 days. A period of time analogous to the concept of "week", used by different societies around the world: the ancient Egyptian calendar, the ancient Chinese calendar, and also the French Republican calendar (in which it was called a décade). megasecond: 10 6 s: About 11.6 days. fortnight: 2 weeks: 14 days lunar month: 27 d 4 h 48 min – 29 ...

  4. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. Converting a date between different calendars.

  5. Time - Wikipedia

    en.wikipedia.org/wiki/Time

    Time is the continuous progression of existence that occurs in an apparently irreversible succession from the past, through the present, and into the future. [1] [2] [3] It is a component quantity of various measurements used to sequence events, to compare the duration of events (or the intervals between them), and to quantify rates of change of quantities in material reality or in the ...

  6. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The arrangement of digits on calculator and other numeric keypads with the 7-8-9 keys two rows above the 1-2-3 keys is derived from calculators and cash registers. It is notably different from the layout of telephone Touch-Tone keypads which have the 1 - 2 - 3 keys on top and 7 - 8 - 9 keys on the third row.

  7. Chronology of computation of π - Wikipedia

    en.wikipedia.org/wiki/Chronology_of_computation...

    Computation of binary digits: 80 days; Conversion to base 10: 8.2 days; Verification of the conversion: 45.6 hours; Verification of the binary digits: 64 hours (Bellard formula), 66 hours (BBP formula) Verification of the binary digits were done simultaneously on two separate computers during the main computation.

  8. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    In English: "a number consisting of a whole series of figures, as long as it may be (in proportion to the size of the machine)". His first preliminary brass machine was built between 1674 and 1685. His so-called older machine was built between 1686 and 1694. The 'younger machine', the surviving machine, was built from 1690 to 1720. [2]

  9. Biblical numerology - Wikipedia

    en.wikipedia.org/wiki/Biblical_numerology

    Revelation uses the number twelve to refer to the number of angels (Rev. 21:14), number of stars (12:1), twelve angels at twelve gates each of which have the names of the twelve apostles inscribed (Rev. 21:12), the wall itself being 12 x 12 = 144 cubits in length (Rev. 21:17) and is adorned with twelve jewels, and the tree of life has twelve ...