15 December
1612: On 15 December 1612, Simon Marius became the first person to spot another galaxy (Andromeda) through a telescope.Marius was a German astronomer who made observations of the stars and ...
31 DÉC. 2003
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1826: Giovanni Battista Donati was born.
Donati was an Italian astronomer who, on 5 August 1864, was the first to observe the spectrum of a comet (Comet 1864 II). This observation indicated correctly that comet tails contain luminous gas and do not shine merely by reflected sunlight.
He also discovered the comet now known as Donati's Comet at Florence on 2 June 1858.
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14 December
1546: On 14 December 1546, Tycho Brahe was born.Brahe was a Danish astronomer whose work in developing astronomical instruments and in measuring and fixing the positions of stars paved the ...
13 December
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 ...
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 ...
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