1. Preface

   EditorialNotes 01 October 1971 Pages: 127 - 127

2. Proceedings of IAU Colloquium No. 9, the IAU System of Astronomical Constants, Heidelberg, 12–14 August 1970

   • B. Emerson
   • G. A. Wilkins

   Report 01 October 1971 Pages: 128 - 149

3. Determinations of precession

   • Walter Fricke

   ReviewPaper 01 October 1971 Pages: 150 - 162

4. On the correction to precession from proper motions referred to galaxies

   • S. Vasilevskis
   • A. R. Klemola

   OriginalPaper 01 October 1971 Pages: 163 - 170

5. The excess secular change in the obliquity of the ecliptic and its relation to the internal motion of the Earth

   • Shinko Aoki
   • Chuichi Kakuta

   OriginalPaper 01 October 1971 Pages: 171 - 181

6. Notes on equinox motion and corrections to precession

   • T. C. Van Flandern

   OriginalPaper 01 October 1971 Pages: 182 - 185

7. Observed and theoretical values of the nutations

   • R. O. Vicente

   OriginalPaper 01 October 1971 Pages: 186 - 189

8. Precession-nutations and tidal potential

   • P. Melchior

   OriginalPaper 01 October 1971 Pages: 190 - 212

9. Détermination des masses des planétes

   • Jean Kovalevsky

   ReviewPaper 01 October 1971 Pages: 213 - 223

10. A determination of the masses of the five outer planets

    • R. L. Duncombe
    • W. J. Klepczynski
    • P. K. Seidelmann

    OriginalPaper 01 October 1971 Pages: 224 - 232

11. Simultaneous solution for the masses of the principal planets from analysis of optical, radar, and radio tracking data

    • J. H. Lieske
    • W. G. Melbourne
    • W. S. Sinclair

    OriginalPaper 01 October 1971 Pages: 233 - 245

12. The planetary masses and the orbits of the first four minor planets

    • J. Schubart

    OriginalPaper 01 October 1971 Pages: 246 - 249

13. Correction to the mass of Jupiter derived from the motion of (153) Hilda, (279) Thule, and (334) Chicago

    • H. Scholl

    OriginalPaper 01 October 1971 Pages: 250 - 252

14. The masses of the principal planets

    • W. J. Klepczynski
    • P. K. Seidelmann
    • R. L. Duncombe

    OriginalPaper 01 October 1971 Pages: 253 - 272

15. Corrections to the lunisolar precession and the motion of the equinox from proper motions of Cepheids

    • A. M. Sinzi

    OriginalPaper 01 October 1971 Pages: 273 - 276

16. Sur l'effet d'une correction de la constante de la précession

    • A. Bec

    OriginalPaper 01 October 1971 Pages: 277 - 278

17. The 1964 IAU system and the Geodetic Reference System 1967

    • J. Kovalevsky

    OriginalPaper 01 October 1971 Pages: 279 - 280