Friedrich von Hahn

Reconstructed tower of the Remplin Observatory Friedrich II. Graf von Hahn (July 27, 1742 – October 9, 1805) was a German nobleman, a philosopher and astronomer born in Neuhaus, Duchy of Holstein, Holy Roman Empire (the area was also at the same time part of Denmark-Norway). He suggested the Doppler effect before Doppler. Provided by Wikipedia
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