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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. 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 ...

  5. 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.

  6. 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 ...

  7. 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.

  8. Winter solstice - Wikipedia

    en.wikipedia.org/wiki/Winter_solstice

    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 which it occurs.

  9. 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 ...

  10. Portal:Current events/December 2009 - Wikipedia

    en.wikipedia.org/.../December_2009

    December 2009 was the twelfth and final month of that common year. The month, which began on a Tuesday, ended on a Thursday after 31 days. It was the last month of the 2000s decade. Portal:Current events. This is an archived version of Wikipedia's Current events Portal from December 2009.

  11. Remembrance Day - Wikipedia

    en.wikipedia.org/wiki/Remembrance_Day

    Remembrance Day in Sri Lanka, also known as the National War heroes commemoration day, marks the capitulation of the Liberation Tigers of Tamil Eelam (LTTE) and the end to the Sri Lankan Civil War on 18 May 2009. The day is a war heroes commemoration day as well as a remembrance day for civilians who died in the war from both sides.