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Friedrich Tietjen (* 15. Oktober 1832 in Garnholt (hüdtodag Westerstede); † 21. Juni 1895 in Berlin) weer en düütsch Astronom.
He hett 1865 den Asteroiden (86) Semele opdeckt. Van 1874 bit to sien Dood weer he Direkter vun dat Astronomisch Reken Institut (ARI) in Heidelbarg.
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