Dynamics of the Solar System : Symposium No. 81 Proceedings of the 81st Symposium of the International Astronomical Union Held in Tokyo, Japan, 23-26 May, 1978 : Springer : 9789027709769 : 9027709769 : 30 Apr 1979 : B. G. Marsden Harvard-Smithsonian Center for Astrophysics Cambridge, MA 02138, U.S.A. !AU Symposium No. 81, "Dynamics of the Solar System", was held at the Hydrographic Office, Tokyo, Japan, during 23-26 May 1978. The Sym­ posium was cosponsored by COSPAR and IUTAM, and generous financial sup­ port was also provided by the Japan Society for the Promotion of Science. !AU sponsorship was through Commissions 4, 7 and 20, and the Scientific Organizing Committee consisted of the current Presidents, Vice Presi­ dents and immediate Past Presidents of these Commissions: V. K. Abalakin, R. L. Duncombe, Y. Kozai, L. Kresak, B. G. Marsden (Chairman), P. J. Message, A. M. Sinzi, G. Sitarski and V. G. Szebehely. There were 64 participants from 15 countries, and 55 invited and contribute