Highlights of Astronomy: As Presented at the XVth General Assembly and the Extra Ordinary General Assembly of the I.A.U. 1973 [Paperback]

The year 1973 marked the highest peak of IAU activity up to now. Besides the Gen? eral Assembly in Sydney, and the Extraordinary General Assembly in Poland, there were held eleven IAU Symposia and one Colloquium. Several IAU Publications cover this activity. The Proceedings of the Symposia are published in separate Volumes, while the Transactions of the General Assembly and of the Extraordinary General Assembly contain short reports of the Commission meetings, the administrative sessions, and the opening ceremonies. The present Volume covers some of the scientific Highlights of the General As? sembly and of the Extraordinary General Assembly. It contains five Invited Dis? courses given in Sydney and Poland, some selected papers, and the Joint Discussions at the General Assembly of Sydney. Of course, there were many more papers of special interest presented in Sydney that could not be included in this Volume. Their titles can be seen in the reports of the various Commissions. It is regrettable that the Invited Discourses of C. H. Townes (Interstellar Molecules) and F. J. Low (Infrared Astronomy) were not submitted for publication. Also only five papers or abstracts of the Joint Discussion on the 'Origins of the Moon and Satellites' have been available. Despite these minor shortcomings, I believe that the present Volume is faithful to its title: it gives a substantial part of the Highlights of Astronomy in 1973.Invited Discourses.- A New Look at the Sun.- Early Stages of the Universe.- The Physics of the Interstellar Matter.- Galaxies and Their Nuclei.- The Astronomy and Cosmology of Copernicus.- Selected Papers.- X-Ray Sources in Close Binary Systems.- The Next Decade in Stellar Atmospheres Theory.- The Future of Observational Stellar Atmospheres.- The Next Decade of Theoretical Solar Physics.- The Next Decade in Observational Solar Research.- Asymmetry in Solar Spectral Lines.- Joint Discussions.- I. Precession, Planetary Ephemerides and Time Scales.- Introductory Rlã%