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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. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar is the calendar used in most parts of the world. [1] [a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.

  4. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    For explanation, see the article about the Gregorian calendar. Except where stated otherwise, the transition was a move by the civil authorities from the Julian to the Gregorian calendar. In religious sources it could be that the Julian calendar was used for a longer period of time, in particular by Protestant and Eastern Orthodox churches. The ...

  5. Category:Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Category:Gregorian_calendar

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  6. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.

  7. Wikipedia : WikiProject Calendars

    en.wikipedia.org/.../Wikipedia:WikiProject_Calendars

    Wikiproject Calendars compiles worldwide holidays in different calendar formats, and provides links to information on each holiday. Please feel free to add holidays to the calendars, and move the blue square that highlights the current day.

  8. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    For determination of the day of the week (January 1, 2000, Saturday) the day of the month: 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.

  9. Determination of the day of the week - Wikipedia

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

    Gauss's method was applicable to the Gregorian calendar. He numbered the weekdays from 0 to 6 starting with Sunday. He defined the following operation. Inputs Year number A, month number M, date number D. Output Day of year. Procedure. First determine the day-of-week d 1 of 1 January. For a Gregorian calendar, the weekday is [5]