Friedrich von Hahn
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Friedrich II. Graf von Hahn (July 27, 1742 – October 9, 1805) was a German nobleman, a philosopher and astronomer.
Von Hahn was born in Neuhaus, Holstein. In 1793 he started the construction of a private observatory, the first in Mecklenburg, which was well equipped. He owned some of the largest mirrors made by William Herschel and precision instruments for determining the position of stars. In 1800, he discovered the central star in M57, the Ring Nebula in the constellation Lyra.
He died in Remplin, Mecklenburg. After his death, his son, the "theatrical count", squandered his fortune and all books and instruments were sold. The best instruments were bought by Friedrich Wilhelm Bessel for the new observatory in Königsberg. One instrument is on display in the Deutsches Museum in Munich.
He is honoured together with Otto Hahn by the lunar crater Hahn.
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