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  2. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  3. 2009 - Wikipedia

    en.wikipedia.org/wiki/2009

    t. e. 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 ...

  4. December 18 - Wikipedia

    en.wikipedia.org/wiki/December_18

    2015 (Friday) 2014 (Thursday) 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.

  5. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    Before the Spring and Autumn period (before 770 BC), the Chinese calendars were solar calendars. [18] In the so-called five-phase calendar, the year consists of 10 months and a transition, each month being 36 days long, and the transitions 5 or 6 days.

  6. 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 ...

  7. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Lunar Hijri calendar is a lunar calendar consisting of 12 months in a year of 354 or 355 days. The astronomer's mean tropical year, which is averaged over equinoxes and solstices, is currently 365.24219 days, slightly shorter than the average length of the year in most calendars. A year can also be measured by starting on any other named ...

  8. 2012 phenomenon - Wikipedia

    en.wikipedia.org/wiki/2012_phenomenon

    Unlike the 260-day tzolkʼin still used today among the Maya, the Long Count was linear rather than cyclical, and kept time roughly in units of 20: 20 days made a uinal, 18 uinals (360 days) made a tun, 20 tuns made a kʼatun, and 20 kʼatuns (144,000 days or roughly 394 years) made up a bʼakʼtun. Thus, the Maya date of 8.3.2.10.15 represents ...

  9. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.