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  2. 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.

  3. Names of the days of the week - Wikipedia

    en.wikipedia.org/wiki/Names_of_the_days_of_the_week

    Colloquially, the week is also known as the "Worship" (simplified Chinese: 礼拜; traditional Chinese: 禮拜; pinyin: Lǐbài), with the names of the days of the week formed accordingly. This is also dominant in certain regional varieties of Chinese. The following is a table of the Mandarin names of the days of the weeks.

  4. Week - Wikipedia

    en.wikipedia.org/wiki/Week

    Several cultures used a five-day week, including the 10th century Icelandic calendar, the Javanese calendar, and the traditional cycle of market days in Korea. [citation needed] The Igbo have a "market week" of four days. Evidence of a "three-day week" has been derived from the names of the days of the week in Guipuscoan Basque. [64]

  5. 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.

  6. Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Hebrew_calendar

    The names for the days of the week are simply the day number within the week. The week begins with Day 1 and ends with Shabbat . (More precisely, since days begin in the evening, weeks begin and end on Saturday evening. Day 1 lasts from Saturday evening to Sunday evening, while Shabbat lasts from Friday evening to Saturday evening.)

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  8. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    Note: In this algorithm January and February are counted as months 13 and 14 of the previous year. E.g. if it is 2 February 2010 (02/02/2010 in DD/MM/YYYY), the algorithm counts the date as the second day of the fourteenth month of 2009 (02/14/2009 in DD/MM/YYYY format) For an ISO week date Day-of-Week d (1 = Monday to 7 = Sunday), use

  9. Why is it called Black Friday? Here's the real history behind ...

    www.aol.com/news/why-called-black-friday-heres...

    Holiday names are usually pretty straightforward. New Year's, Thanksgiving and — perhaps least creatively, the 4th of July — all have origins that are fairly easy to figure out. But Black ...