12 December
1871: On 12 December 1871, French astronomer Jules Janssen made spectroscopic observations of an eclipse in India.The observation confirmed his own theory that the corona, normally only visible during a ...
31 JOULU. 2003
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1805: On 13 December 1805, Johann von Lamont was born.
Von Lamont was a Scottish-born German astronomer who is noted for discovering that the magnetic field of Earth fluctuates with a 10.3-year activity cycle, but does not correlate it with the period of the sunspot cycle. From 1 August 1840, Johann von Lamont (as director of the Royal Astronomical Observatory in Munich) started regular and permanent observations of Earth's magnetic field. In the 1850s he started making regional magnetic surveys in the kingdom of Bavaria, later extended to other states in south Germany, France, Holland, Belgium, Spain, Portugal, Prussia and Denmark.
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11 December
1972: On 11 December 1972, Apollo 17 astronauts Gene Cernan and Harrison Schmitt landed on the Moon for a three-day exploration.This would be the final Apollo mission to the Moon.
10 December
1999: On 10 December 1999, ESA's XMM-Newton mission was launched.XMM-Newton can detect more X-ray sources than any previous satellite and is helping to solve many cosmic mysteries of the violent ...
9 December
1978: On 9 December 1978, NASA's Pioneer Venus Multiprobe (PVM) entered the atmosphere of Venus.PVM consisted of a 'bus', a vehicle which carried one large and three small atmospheric probes. ...
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