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  2. Biorhythm (pseudoscience) - Wikipedia

    en.wikipedia.org/wiki/Biorhythm_(pseudoscience)

    Theories published state the equations for the cycles as: physical: ⁡ (/), emotional: ⁡ (/), intellectual: ⁡ (/), where indicates the number of days since birth. Basic arithmetic shows that the combination of the simpler 23- and 28-day cycles repeats every 644 days (or 1 3 ⁄ 4 years), while the triple combination of 23-, 28-, and 33-day cycles repeats every 21,252 days (or 58.18+ years).

  3. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    100 days, roughly equivalent to 1/4 of a year (91.25 days). In Chinese tradition "bǎi rì" is the hundredth day after one's birth, also called Baby's 100 Days Celebration. semester: 18 weeks: A division of the academic year. [6] Literally "six months", also used in this sense. lunar year: 354.37 d: year: 12 mo: 365 or 366 d: common year: 365 d

  4. Prophetic Year - Wikipedia

    en.wikipedia.org/wiki/Prophetic_Year

    These references represent a period of 1260 days (based on the 360 day Jewish year multiplied by 3.5). [4] Divide 1,260 days by 42 months and you will get a 30-day month, as 12 months of 30 days equals 360-days in a year These time periods occur ten times in scripture: Daniel 7:25, "time, times and a half". Daniel 9:27, "half one set of seven".

  5. Day count convention - Wikipedia

    en.wikipedia.org/wiki/Day_count_convention

    The days in the numerators are calculated on a Julian day difference basis. In this convention the first day of the period is included and the last day is excluded. The CouponFactor uses the same formula, replacing Date2 by Date3. In general, coupon payments will vary from period to period, due to the differing number of days in the periods.

  6. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    Combining the two enables the page headers to show any fixed or movable festival observed on the day, and whether it is a bank holiday. The algorithm utilises the integral or floor function: thus ⌊ ⌋ is that part of the number x which lies to the left of the decimal point. It is only necessary to work through the complete function when ...

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  8. Lunar month - Wikipedia

    en.wikipedia.org/wiki/Lunar_month

    This longer period is called the anomalistic month [15] and has an average length of 27.554 551 days (27 d 13 h 18 min 33.2 s). The apparent diameter of the Moon varies with this period, so this type has some relevance for the prediction of eclipses (see Saros ), whose extent, duration, and appearance (whether total or annular) depend on the ...

  9. Date of Easter - Wikipedia

    en.wikipedia.org/wiki/Date_of_Easter

    In practice, for the purpose of calculating Easter, this need not be done for all 365 days of the year. For the epacts, March comes out exactly the same as January, because 31+28 days = 30+29 epacts, so one need not calculate January or February. To avoid the need to calculate the dominical letters for January and February, start with D for 1 ...