A research center for celestial mechanics was established at Yale University during the summer under the sponsorship of the Air Force Office of Scientific Research and the Office of Naval Research. Activities at the center will deal generally with problems in applied mathematics and astronomy involving the effects of gravitational forces on the motion of bodies in space. Special emphasis will be given to the further refinement of lunar theory and to the problems of predicting the paths of orbiting satellites and the trajectories of lunar and interplanetary probes and vehicles.