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  2. Names of the days of the week - Wikipedia

    en.wikipedia.org/wiki/Names_of_the_days_of_the_week

    The Babylonians invented the actual [clarification needed] seven-day week in 600 BCE, with Emperor Constantine making the Day of the Sun (dies Solis, "Sunday") a legal holiday centuries later. [2] In the international standard ISO 8601, Monday is treated as the first day of the week, but in many countries it is counted as the second day of the ...

  3. 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.

  4. Block scheduling - Wikipedia

    en.wikipedia.org/wiki/Block_scheduling

    Under a traditional American schedule, pupils in a high school will study seven subjects a day for 45 minutes for each day of the week for a semester. There will be two semesters in the year so 14 subjects could be studied. Some pupils will not study all seven subjects. There was great variety as each school board was free to decide the ...

  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. Sunday - Wikipedia

    en.wikipedia.org/wiki/Sunday

    In many European countries, calendars show Monday as the first day of the week, [11] which follows the ISO 8601 standard. In the Persian calendar, used in Iran and Afghanistan, Sunday is the second day of the week. However, it is called "number one" as counting starts from zero; the first day - Saturday - is denoted as day zero.

  7. Days of week on Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Days_of_week_on_Hebrew...

    The result is that all dates from 1 Nisan through 29 (or 30) Cheshvan can each fall on one of four days of the week. Dates during Kislev can fall on any of six days of the week; during Tevet and Shevat, five days; and dates during Adar (or Adar I and II, in leap years) can each fall on one of four days of the week.

  8. Week - Wikipedia

    en.wikipedia.org/wiki/Week

    First day of week First week of year contains Can be last week of previous year Used by or in ISO 8601: Monday: 4 January: 1st Thursday: 4–7 days of year: yes: EU (exc. Portugal) and most of other European countries, most of Asia and Oceania Middle Eastern: Saturday: 1 January: 1st Friday: 1–7 days of year: yes: Much of the Middle East ...

  9. Category:Days of the week - Wikipedia

    en.wikipedia.org/wiki/Category:Days_of_the_week

    Afrikaans; Alemannisch; Аԥсшәа; العربية; Aragonés; ܐܪܡܝܐ; Armãneashti; Arpetan; Asturianu; Azərbaycanca; বাংলা; Banjar; Башҡортса