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  2. Determination of the day of the week - Wikipedia

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

    For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.

  3. Monday's Child - Wikipedia

    en.wikipedia.org/wiki/Monday's_Child

    Those born on a Tuesday grew up sinful and perverse, while those born on a Wednesday were waspish in temper. A child born on Thursday, however, was sure to be of a peaceful and easy disposition, though averse to women. Friday was supposed to be the most unlucky day of all, it being prophesied that a child born on this day would grow up to be ...

  4. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    To find which day of the week Christmas Day of 2021 is, proceed as follows: in the year 2021, doomsday is on Sunday. Since December 12 is a doomsday, December 25, being thirteen days afterwards (two weeks less a day), fell on a Saturday. Christmas Day is always the day of the week before doomsday.

  5. Solomon Grundy (nursery rhyme) - Wikipedia

    en.wikipedia.org/wiki/Solomon_Grundy_(nursery_rhyme)

    "Dashing Away with the Smoothing Iron", a traditional English folk song written in the 19th century about a housewife carrying out one part of her linen chores each day of the week "Monday's Child", a traditional English rhyme mentioning the days of the week; Solomon Grundy (character), DC Comics character named after the rhyme

  6. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    Zeller's congruence is an algorithm devised by Christian Zeller in the 19th century to calculate the day of the week for any Julian or Gregorian calendar date. It can be considered to be based on the conversion between Julian day and the calendar date.

  7. Planetary hours - Wikipedia

    en.wikipedia.org/wiki/Planetary_hours

    The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other languages.

  8. Calculating the day of the week - Wikipedia

    en.wikipedia.org/?title=Calculating_the_day_of...

    Retrieved from "https://en.wikipedia.org/w/index.php?title=Calculating_the_day_of_the_week&oldid=473328703"

  9. Estimated date of delivery - Wikipedia

    en.wikipedia.org/wiki/Estimated_date_of_delivery

    Naegele was born July 12, 1778, in Düsseldorf, Germany. In 1806, Naegele became ordinary professor and director of the lying-in hospital in Heidelberg. His Lehrbuch der Geburtshilfe, published in 1830 for midwives, enjoyed a successful 14 editions. Here's the formula to calculate your Estimated Due Date using Naegele's rule :