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The IYA2009 logo International Year of Astronomy commemorative coin. The International Year of Astronomy (IYA2009) was a year-long celebration of astronomy that took place in 2009 to coincide with the 400th anniversary of the first recorded astronomical observations with a telescope by Galileo Galilei and the publication of Johannes Kepler's Astronomia nova in the 17th century. [1]
Printable version; In other projects Appearance. move to sidebar hide Astronomy ... Astronomy events in 2009 by month << 2009 >> ...
1 January: Beginning of International Year of Astronomy: 3 January: Quadrantids peak : 4 January, 14:00: Mercury at maximum eastern elongation: 4 January, 14:00: Earth at perihelion: 10 January, 11:00
Astronomy: A mixture of Julian and Gregorian calendar, giving dates before 1582 in the Julian calendar, and dates after 1582 in the Gregorian calendar, counting 1 BC as year zero, and negative year numbers for 2 BC and earlier. French Republican Calendar: solar: Gregorian: 1793: First French Republic: In use in revolutionary France 1793 to 1805 ...
Printable version; In other projects Appearance. move to sidebar hide 4 September, 16:04: Full moon: 13 ... Portal: Astronomy/Events/September 2009.
2009 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.
There is a disagreement between astronomers and historians about how to count the years preceding year 1. In [Astronomical Algorithms], the 'B.C.' years are counted astronomically. Thus, the year before the year +1 is the year zero, and the year preceding the latter is the year −1. The year which historians call 585 B.C. is actually the year ...