In 1872, Strasbourg University Observatory was founded by the German government as a model observatory - for its construction, its instrumentation as well as its the staff. Unique working conditions were offered. The 49cm refractor was at that time the largest in the German empire and showed the importance given to Strasbourg Observatory. The director and the staff in Strasbourg in the German time from 1872 to 1918 were first-class astronomers. But already in 1872 and again in 1895, one did not succeed to introduce the new topicc of astrophysics. Thus Strasbourg became famous for the field of classical astronomy, i.e. compiling catalogues of stars with data like positions, magnitudes, proper motions and so on, as well as calculating orbits of planets and comets according to the formulae of celestial mechanics.