Friedrich Wilhelm Bessel (* 22. July 1784 Minden † 17. March 1846 Konigsberg i.Pr.) was a merchant wo studied astronomy, mathematics, geodesy and physics by himself. He was the director of the university observatory in Konigsberg and managed the land survey of East-Prussia. He met Gauß through Wilhelm Olbers and they shared their knowledge on their research projects via letters and visits.

Sources: Wikipedia, Deutsche Bibliographie

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