Highlights of Astronomy, Volume 11A: As presented at the XXIIIrd General Assembly of the IAU, 1997

Since 1967, the main scientific events of the General Assemblies of the International Astronomical Union have been published in the separate series, Highlights of Astronomy. The present Volume 11 presents the major scientific presentations made at the 23rd General Assembly, August 18-30, 1997, in Kyoto, Japan. The two volumes (volumes 11A and 11B) contain the text of the three invited discourses, as well as the proceedings or extended summaries of the 21 joint discussions and two special sessions held during the General Assembly.