sentences:  In 1936 he was appointed Professor of Theoretical Geodesy and Spherical astronomy at the Vienna University of Technology, as successor to Richard Schumann.In autumn 1942 he declined Hitler's invitation into his newly created Academy of Sciences ("Akademie der Wissenschaften") in Prague, and was forced into retirement, moving with his family to Schönbühel on the Danube, where he devoted himself exclusively to research.After the war he was restored to his position in Vienna, and was later elected Dean of the Faculty of Applied Maths and Physics.