Karl Friedrich Küstner

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][failed verification]}

Karl Friedrich Küstner in 1931

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

Küstner at the 1910 Fourth Conference International Union for Cooperation in Solar Research at Mount Wilson Observatory