Zum gegenwärtigen Stand der relativistischen Himmelsmechanik.

The present status of relativistic celestial mechanics is briefly reviewed. Essential for the formulation of classical celestial mechanics is the use of simplifying concepts such as multipole-moments, the spin-vector etc. These concepts can be employed successfully in the first post-Newtonian approximation of Eintein's theory. However, certain classical orientation concepts like ecliptic, celestial equator and equinox do not fit into the relativistic framework and should be abandoned.