This volume contains the fifteenth tri-annual reports of the Presidents of the forty Commissions of the International Astronomical Union; it refers to the progress in our discipline during the three years 1970, 1971 and 1972. As compared to earlier volumes a gradual change in character is unmistakable. The ever increasing flow of publications, combined with the obvious necessity to keep the Reports at a reasonable size and price level has gradually forced the Commission Presidents to be more selective than before in drafting their Reports. I have certainly stimulated them into that direction - in order that Reports like these be valuable and lasting, it seems imperative that the individual contributions have the character of a critical overall review, where a fairly complete summary is given of the major develop­ ments and discoveries of the past three years, and in which the broad developments and new trends be clearly outlined, while at the same time essential problems for future research are identified. With respect to the latter item I have suggested the Commission Presidents to add to their reports a brief section on scientific priorities for future research in the field of their Commissions. In order to save space I have suggested to Commission Presidents that references to published papers are given on the basis of their number in the published issues of Astronomy and Astrophysics Abstracts. For instance, the indication (06. 078. 019) or (AAA 06. 078.

lgrsnf/A:\Springer\bok%3A978-94-010-2587-4.pdf

nexusstc/Transactions of the International Astronomical Union Volume XVA: Reports on Astronomy/6628731852826250da19969ede728de9.pdf

zlib/Astronomy/Cornelis De Jager (auth.), Cornelis De Jager (eds.)/Transactions of the International Astronomical Union Volume XVA: Reports on Astronomy_2241451.pdf

Transactions of the International Astronomical Union: Reports on Astronomy (International Astronomical Union Transactions)

Springer Science + Business Media BV

Springer International Publishing

Springer London, Limited

Springer Nature, Dordrecht, 2012

Netherlands, Netherlands

Dordrecht, 1973

Cham, 20uu

lg1072485

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Front Matter....Pages I-VIII
Éphémérides....Pages 1-10
Documentation....Pages 11-14
Astronomical Telegrams....Pages 15-17
Celestial Mechanics....Pages 19-27
Positional Astronomy....Pages 29-41
Instruments and Techniques....Pages 43-73
Solar Activity....Pages 75-128
Radiation and Structure of the Solar Atmosphere....Pages 129-154
Fundamental Spectroscopic Data....Pages 155-177
Phiysical Study of Comets....Pages 179-190
Physical Study of Planets and Satellites....Pages 191-201
The Moon....Pages 203-214
Rotation of the Earth....Pages 215-224
Positions and Motions of Minor Planets, Comets and Satellites....Pages 225-239
Light of the Night-Sky....Pages 241-252
Meteors and Meteorites....Pages 253-273
Photographic Astrometry....Pages 275-283
Stellar Photometry....Pages 285-295
Étoiles Doubles....Pages 297-311
Variable Stars....Pages 313-356
Galaxies....Pages 357-386
Stellar Spectra....Pages 387-405
Vitesses Radiales....Pages 407-414
Time....Pages 415-429
Structure and Dynamics of the Galactic System....Pages 431-466
Interstellar Matter and Planetary Nebulae....Pages 467-506
Stellar Constitution....Pages 507-535
Theory of Stellar Atmospheres....Pages 537-569
Star Clusters and Associations....Pages 571-597
Exchange of Astronomers....Pages 599-600
Radio Astronomy....Pages 601-637
History of Astronomy....Pages 639-646
Photometric Double Stars....Pages 647-667
Astrophysical Plasmas and Magnetohydrodynamics....Pages 669-670
Astronomical Observations from Outside the Terrestrial Atmosphere....Pages 671-695
Spectral Classifications and Multi-Band Colour Indices....Pages 697-716
Teaching of Astronomy....Pages 717-727
Cosmology....Pages 729-735
High Energy Astrophysics....Pages 737-755
Back Matter....Pages 757-760

2013-12-12