Proceedings of the 63rd Colloquium of the International Astronomical Union, held at Grasse, France, May 22-27, 1982

Inhalt

I.- Combination of Earth rotation parameters obtained in 1980 by various techniques.- Optical observations of Time and Latitude and the determining of the Earth's rotation parameters in 1980.- Rotation of the Earth from Lunar Laser Ranging.- Earth rotation from a simultaneous reduction of LLR and LAGEOS laser ranging data.- Earth rotation in the EROLD framework.- Intercomparison of Lunar Laser and traditional determinations of Earth rotation.- An intercomparison of Connected-Element Interferometer and Lunar Laser Earth rotation parameters.- Earth rotation information derived from MERIT and POLARIS VLBI observations.- Polar motion and Earth rotation from LAGEOS Laser ranging.- Comparison of polar motion results using Lunar Laser Ranging.- The pole position in October 1980 as determined from LAGEOS laser data.- Comparison of polar motion data from the 1980 project MERIT short campaign.- Progress report on project MERIT.- General Discussion.- II.- Dependence of the lunisolar perturbations in the Earth rotation on the adopted Earth model.- Atmospheric angular momentum and the length of day.- Earth's rotation and polar motion based on Global Positioning System satellite data.- Activities of astro-geodynamics research in China.- III.- Dissipation in the Moon : A review of the experimental evidence and physical implications.- Planetary and Earth figure perturbations in the librations of the Moon.- Modelling the effect of Earth tides in the lunar orbital motion.- Is the gravitational constant changing ?.- Results from Lunar Laser Ranging data analysis.- The relativistic planetary perturbations and the orbital motion of the Moon.- Analytical theories of the motion of the Moon.- Numerical studies of the lunar orbit at CERGA.- Comparison of lunar ephemerides (SALE and ELP) with numerical integration.- Comparison of ELP-2000 to a JPL numerical integration.- Note about a new evaluation of the direct perturbations of the planets on the Moon's motion.- IV.- Relations between celestial and selenocentric reference frames.- On the absolute orientation of the selenodetic reference frame.- On the accuracy of the 1980 IAU nutation series.- Comments on the effect of adopting new precession and equinox corrections.- Determination of coordinates for the Orroral lunar ranging station.- Biases in pole position computed from data from different Navy Navigation satellites.- VLBI measurements of radio source positions at three U.S. stations.- Expansion of the disturbing function by factorization.- General discussion.- Adopted resolution.- Index of subjects and names.