This volume contains papers presented at the US/European Celestial Workshop organized by the Astronomical Observatory of Adam Mickiewicz University in Poznan, Poland and held in Poznan, from 3 to 7 July 2000. The purpose of the workshop was to identify future research in celestial mechanics and astrometry and encourage collaboration among scientists from eastern and western countries. Also emphasis was placed on attracting young members of the fields from around the world and encouraging them to undertake new research efforts needed for advancements in those fields. There was a full program of invited and contributed presentations on selected subjects and each day ended with a discussion period on a general subject in celestial mechanics. The discussion topics and the leaders were: Resonances and Chaos - A. Morbidelli; Artificial Satellite Orbits - K.T. Alfriend; Near Earth Objects - K. Muinonen; Small Solar System Bodies - I. Williams; and Summary - P.K. Seidelmann. The goal of the discussions was to identify what we did not know and how we might further our knowledge.