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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. 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 ...

  4. 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 ]

  5. 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 ...

  6. Portal:Current events/December 2009 - Wikipedia

    en.wikipedia.org/.../December_2009

    This is an archived version of Wikipedia's Current events Portal from December 2009. December 1, 2009. ( 2009-12-01) (Tuesday) edit. history. watch. Porfirio Lobo Sosa is elected President of Honduras. Turnout increases dramatically despite ousted former President Manuel Zelaya 's plea for a boycott.

  7. 2009 - Wikipedia

    en.wikipedia.org/wiki/2009

    2009 ( MMIX) was a common year starting on Thursday of the Gregorian calendar, the 2009th year of the Common Era (CE) and Anno Domini (AD) designations, the 9th year of the 3rd millennium and the 21st century, and the 10th and last year of the 2000s decade. 2009 was designated as the International Year of Astronomy [1] [2] by the United Nations ...

  8. Winter solstice - Wikipedia

    en.wikipedia.org/wiki/Winter_solstice

    The winter solstice occurs during the hemisphere's winter. In the Northern Hemisphere, this is the December solstice (December 21, December 22, or December 23) and in the Southern Hemisphere, this is the June solstice (June 20, June 21, or June 22). Although the winter solstice itself lasts only a moment, the term also refers to the day on ...

  9. Gaza War (2008–2009) - Wikipedia

    en.wikipedia.org/wiki/Gaza_War_(2008–2009)

    On 15 December, Israel assassinated a senior Palestinian commander in Jenin, sparking a round of attacks between Israel and Hamas. On 17 December, a 40-year-old Palestinian was killed by IDF fire in Northern Gaza. The following day, 18 December, Hamas declared the end of the cease-fire, a day before the truce officially expired.