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  2. Determination of the day of the week - Wikipedia

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

    The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...

  3. December 18 - Wikipedia

    en.wikipedia.org/wiki/December_18

    December 18 is the 352nd day of the year (353rd in leap years) in the Gregorian calendar; 13 days remain until the end of the year. Events [ edit ] Pre-1600 [ edit ]

  4. Portal:Current events/2009 December 18 - Wikipedia

    en.wikipedia.org/.../2009_December_18

    Current events/2009 December 18. Thirty world leaders present in Copenhagen for the United Nations Conference on Climate Change agree on a draft accord. ( The Sydney Morning Herald) (Forbes.com "Silver Lining In Copenhagen 'Fiasco'") (AllAfrica.com "Copenhagen Accord Politically Significant But Not Legally Binding") (Associated Press "China ...

  5. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    Its last day is the Sunday nearest to 31 December. It has 28 December in it. Hence the earliest possible last week extends from Monday 22 December to Sunday 28 December, the latest possible last week extends from Monday 28 December to Sunday 3 January. If 31 December is on a Monday, Tuesday, or Wednesday it is in W01 of the next year.

  6. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    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. In addition, July 4 ( U.S. Independence Day ) is always on the same day of the week as a doomsday, as are Halloween (October 31), Pi Day (March 14), and December 26 ...

  7. List of Billboard Mainstream Top 40 number-one songs of 2009

    en.wikipedia.org/wiki/List_of_Billboard...

    Mainstream Top 40 number-one songs of 2009. This is a list of songs which reached number one on the Billboard Mainstream Top 40 (or Pop Songs) chart in 2009. During 2009, a total of 20 singles hit number-one on the charts.

  8. List of Doctor Who episodes (2005–present) - Wikipedia

    en.wikipedia.org/wiki/List_of_Doctor_Who_episodes...

    Doctor Who is a British science fiction television programme produced by the BBC. As of 8 June 2024, 881 episodes of Doctor Who have aired. This includes one television movie and multiple specials, and encompasses 310 stories over 40 seasons, starting in 1963. Additionally, four charity specials and two animated serials have also been aired. The programme's high episode count has resulted in ...

  9. Names of the days of the week - Wikipedia

    en.wikipedia.org/wiki/Names_of_the_days_of_the_week

    After the week was adopted in early Christianity, Sunday remained the first day of the week, but also gradually displaced Saturday as the day of celebration and rest, being considered the Lord's Day. Saint Martin of Dumio (c. 520–580), archbishop of Braga , decided not to call days by pagan gods and to use ecclesiastic terminology to ...