Address by -- Opening Address by -- Address by -- New Impetus to the Exploration of the Solar System (Inaugural Address) -- The Solar System - Known Facts and Unsolved Problems (Opening Invited Lecture) -- Section I - Sun from the Astronomical and Physical Points of View -- Section II - Astronomical, Geophysical and Geodetic Problems Related to the Earth -- Section III - Physics of Planets, Minor Planets, Satellites and Interplanetary Medium -- Section IV - Motions in the Planetary System -- Section V - Three-Dimensional Refraction -- List of Participants.