20 September

Reproduction of original plates of Comet Halley 25 May 1910
27 FEB. 2004 publication date 1175 Views

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.


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