Karl Friedrich Küstner (born in Görlitz on 22 August 1856, died 15 October 1936) was a German astronomer who also made contributions to Geodesy. In 1888 he reportedly discovered the Polar motion of the Earth.[1] In 1910 he received the Gold Medal of the Royal Astronomical Society for cataloguing stars and detecting latitude variation.[2]

He received his PhD from the University of Strasbourg in 1879 under Friedrich August Theodor Winnecke.[3]

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