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.

From left, clockwise: The vertical stabilizer of Air France Flight 447 is pulled out from the Atlantic Ocean; Barack Obama becomes the first African American to become President of the United States; Protests erupt over the 2009 Iranian presidential election; US Airways Flight 1549 crash-lands in the Hudson River with no fatalities, with the event becoming known as the "Miracle on the Hudson"; The "King of Pop" Michael Jackson died in 2009; Bitcoin is initially launched by the pseudonymous name Satoshi Nakamoto; the 2009 L'Aquila earthquake strikes central Italy; The H1N1 virus was responsible for the 2009 swine flu pandemic.
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Millennium: 3rd millennium
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2009 in various calendars
Gregorian calendar2009
MMIX
Ab urbe condita2762
Armenian calendar1458
ԹՎ ՌՆԾԸ
Assyrian calendar6759
Baháʼí calendar165–166
Balinese saka calendar1930–1931
Bengali calendar1416
Berber calendar2959
British Regnal year57 Eliz. 2  58 Eliz. 2
Buddhist calendar2553
Burmese calendar1371
Byzantine calendar7517–7518
Chinese calendar戊子年 (Earth Rat)
4705 or 4645
     to 
己丑年 (Earth Ox)
4706 or 4646
Coptic calendar1725–1726
Discordian calendar3175
Ethiopian calendar2001–2002
Hebrew calendar5769–5770
Hindu calendars
 - Vikram Samvat2065–2066
 - Shaka Samvat1930–1931
 - Kali Yuga5109–5110
Holocene calendar12009
Igbo calendar1009–1010
Iranian calendar1387–1388
Islamic calendar1430–1431
Japanese calendarHeisei 21
(平成21年)
Javanese calendar1941–1942
Juche calendar98
Julian calendarGregorian minus 13 days
Korean calendar4342
Minguo calendarROC 98
民國98年
Nanakshahi calendar541
Thai solar calendar2552
Tibetan calendar阳土鼠年
(male Earth-Rat)
2135 or 1754 or 982
     to 
阴土牛年
(female Earth-Ox)
2136 or 1755 or 983
Unix time1230768000 – 1262303999
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2009 was designated as the International Year of Astronomy[1][2] by the United Nations to coincide with the 400th anniversary of Galileo Galilei's first known astronomical studies with a telescope and the publication of Astronomia Nova by Johannes Kepler.[3] It was also declared as the International Year of Natural Fibres[4] by the United Nations General Assembly, as well as the International Year of Reconciliation and the Year of the Gorilla (UNEP and UNESCO).