20 September

27 FEAB. 2004 Dáta foilsithe 1176 Amhairc

1873: On 20 September 1873, Giovanni Battista Donati died.

An Italian astronomer, Donati was the first to observe the spectrum of a comet (Comet 1864 II on 5 August 1864). This observation indicated correctly that comet tails contain luminous gas and do not shine merely by reflected sunlight.


Naisc ghaolmhara


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