Reports on Astronomy : Transactions of the International Astronomical Union Volume XXIIA

__IAU Transactions__ are published as a volume corresponding to each General Assembly. Volume A is produced prior to the Assembly and contains __Reports on Astronomy__, prepared by each Commission President. The intention is to summarize the astronomical results that have affected the work of the Commission since the production of the previous __Reports__ up to a time which is about one year prior to the General Assembly. Volume B is produced after the Assembly and contains accounts of Commission Meetings which were held, together with other material. The reports included in the present volume range from outline summaries to lengthy compilations and references. Most reports are in English. Front Matter....Pages i-viii Ephemerides....Pages 1-6 Documentation and Astronomical Data....Pages 7-12 Astronomical Telegrams....Pages 13-14 Celestial Mechanics....Pages 15-28 Positional Astronomy....Pages 29-37 Instruments and Techniques....Pages 39-52 Solar Activity....Pages 53-84 Solar Radiation and Structure....Pages 85-104 Atomic and Molecular Data....Pages 105-134 Physical Study of Comets. Minor Planets and Meteorites....Pages 135-156 Physical Study of Planets & Satellites....Pages 157-168 Earth Rotation....Pages 169-184 Positions and Motions of Minor Planets, Comets and Satellites....Pages 185-204 Light of the Night Sky....Pages 205-209 Meteors and Interplanetary Dust....Pages 211-224 Photographic Astrometry....Pages 225-228 Stellar Photometry and Polarimetry....Pages 229-238 Double and Multiple Stars....Pages 239-242 Variable Stars....Pages 243-276 Galaxies....Pages 277-303 Stellar Spectra....Pages 305-318 Radial Velocities....Pages 319-324 TIME....Pages 325-336 Structure and Dynamics of the Galactic System....Pages 337-365 Interstellar Matter....Pages 367-397 Stellar Constitution....Pages 399-407 Theory of Stellar Atmospheres....Pages 409-424 Star Clusters and Associations....Pages 425-444 Exchange of Astronomers....Pages 445-446 Radio Astronomy....Pages 447-459 History of Astronomy....Pages 461-462 Close Binary Stars....Pages 463-488 Astronomy from Space....Pages 489-524 Stellar Classification....Pages 525-534 Teaching of Astronomy....Pages 535-538 Cosmology....Pages 539-564 The Interplanetary Plasma and the Heliosphere Report of IAU Commission 49....Pages 565-578 Identification and Protection of Existing and Future Observatory Sites....Pages 579-582 Bioastronomy (Commission 51)....Pages 583-593 Back Matter....Pages 595-605