Highlights of Astronomy

I. Invited Discourses.- Pulsars.- Pulsars (Theoretical Considerations).- Observational Evidence for Galactic Spiral Structure.- Theory of Spiral Structure.- II. Special Meeting on Direct Exploration of the Moon.- The Apollo Missions.- Lunar Igneous Activity and Differentiation.- Seismology of the Moon and Implications on Internal Structure, Origin and Evolution.- Induced and Permanent Magnetism on the Moon: Structural and Evolutionary Implications.- III. Joint Discussions.- A. The Origin of the Earth and Planets (Edited by B. M. Middlehurst).- Opening Remarks.- I. Origin of the Solar Nebula (inv. speaker: F. Hoyle).- II. Internal Constitution and Thermal Histories of the Terrestrial Planets (inv. speaker: B. Levin).- III. Internal Constitution of the Giant Planets (inv. speaker: W. De Marcus).- IV. Open Discussion.- B. Helium in the Universe (Edited by J. S. Mathis).- Opening Remarks at Joint Discussion on the Helium in the Universe.- Introductory Talk.- Abundance of Helium in Stellar Atmospheres.- The Abundance of Helium in Stellar Interiors.- Abundances of Helium in Gaseous Nebulae.- Production of Helium by Stellar Evolution.- Production of Helium in Massive Objects.- Helium Production in the Different Cosmological Models.- Helium in the Universe: Final Summary.- C. Interstellar Molecules (Edited by D. McNally).- Introductory Remarks.- 1. The Observations.- Interstellar Molecules - the Optical Region.- Infrared Observations and Interstellar Molecules.- Microwave Evidence for Interstellar Molecules.- Molecules in Dense Clouds and Protostars.- OH as a Constituent of the Interstellar Medium.- ? doublet Radiation from OH Excited Rotational States.- Interstellar Formaldehyde.- The Relative Density of H, OH and H2CO in Interstellar Clouds.- NH3 and H2O emission in ourGalaxy.- Radio Emission from Interstellar Hydrogen Cyanide and X-ogen.- 2. Formation of Molecules.- Laboratory Studies of the Spectra of Interstellar Molecules.- Interstellar Molecule Formation; Radiative Association and Exchange Reactions.- Molecule Formation on Grain Surfaces.- Photochemistry of Atoms and Molecules in the Adsorbed State.- Interstellar Molecules from Cool Stars.- 3. Excitation Mechanisms.- Panel Discussion.- Final Remarks.- D. Atomic Data of Importance for Ultraviolet and X-Ray Astronomy (Edited by C. Jordan).- The Interpretation of Space Observations of Stars and Interstellar Matter.- The Interpretation of XUV Solar Radiation.- Some Problems Relating to Solar Line Identification.- Opacity Sources in the UV Spectrum of the Sun.- Atomic Data of Importance for Ultra-violet and X-Ray Astronomy: a Review of Theory.- Computer Programs for Calculating Atomic Data for Ions.- Collision Strengths for Electron Excitation of Coronal Ions.- The Electron Excitation Rate for the Green Coronal Line at 5303 Å.- The Relative Intensities of Lines from Bei-like Ions in the Solar Spectrum.- The Relevance to Astrophysics of the Results of Recent Experiments with Colliding Charged-Particle Beams.- Results Obtained from Observations of Laboratory Plasmas.- Relativistic Contributions to Energies of Highly Ionized Atoms.- Relativistic Corrections to Atomic Energy Levels.- Magnetic Multipole Transition Probabilities.- Pressure Broadening of UV Lines.- New Results on Electron Broadening of some UV Lines of Nii, Cii, Civ and Si ii, Si iii, Si iv.- On the Polarization and Anisotropy of Solar X-Radiation during Flares.- Summary of the Joint Discussion. Atomic Data of Importance for Ultraviolet and X-Ray Astronomy.- E. Photo-Electric Observations of Stellar Occultations (Edited byT. J. Deeming).- The Value of Photoelectric Occultation Timings in Lunar Motion Studies.- A Comparative Study of Visual and Photoelectric Timing of Occultations.- Geodetic Applications of Grazing Occultations.- The Investigation of Lunar Limb Structure by Means of Stellar Occultations.- Optical and Radio Occultation Analysis.- Seeing Effects on Occultation Curves.- A Data Acquisition System with On-line Computer.- Lunar Occultation Theory and Techniques.- Photoelectric Observations of Occultations in Japan.- A Preliminary Analysis of Photoelectric Occultation Measurements.- The Effects of Filters and Colour on Stellar Occultations and Appropriate Deconvolution Procedures.- Remarks on the Restoration of Occultation Observations.- Analysis of Lunar Occultation Data.- Photometric Observations of the Occultations of Stars by the Moon.- Some recent Observations of Occultations by the Moon.- Angular Diameters of the Red Giants 46 Leo and ø Aqr and Parameters of some Binary Systems from Occultation Observations.- Photoelectric Occultation Observations of Regulus and the Pleiades.- Occultation Studies at the Dominion Astrophysical Observatory.- The Determination of Angular Diameters of Stars.- Closing Remarks.- F. Pulsars, Cosmic Rays and Background Radiation (Edited by M. J. Rees).- Some Astrophysical Aspects of Pulsars.- Pulsars and the Origin of Cosmic Rays.- Surface Composition and Cooling Histories of Neutron Stars.- Remarks on the Role of Pulsars in Cosmic Ray Production.- Composition and Galactic Confinement of Cosmic Rays.- The Cosmic Background Radiation: Some Recent Developments.- IV. The Absolute Magnitudes of the RR Lyrae Stars (Joint Meeting of Commissions 24, 27, 30, 33 and 37) (Edited by W. S. Fitch).- The Absolute Magnitudes of the RR Lyrae Stars.- AbsoluteMagnitudes of RR Lyrae Stars.- Review of Observational Data on RR Lyrae Stars.- Absolute Magnitudes of RR Lyrae Variables.- The Lick Observatory Program on Proper Motions of RR Lyrae Stars.- General Discussion.