The commission held business and scientific sessions at the General Assembly on Friday 18 July 2003. One scientific session has been devoted to the Reports from Services (IERS and IVS) and the Working Group on ``Precession-nutation'', of which complete reports can be found in the IAU Transactions (Vol XXVA, 2003, H. Rickmann ed.). The other scientific session was devoted to (i) IERS2000 Conventions: comparisons of models with observations, (ii) Combination: results and prospects, (iii) The Role of the spatial missions for the determination of the Earth's gravitational potential and relation with Earth's rotation.
Regarding Services that are currently reporting to Commission 19, J. Vondrak, President of the IERS Directing Board, mentioned that the recent IERS Retreat (April 2003) led to the change of the name of the IERS (International Earth rotation and Reference frames Service) and to starting a new Combination Pilot Project.
Regarding Commission 19 Working Groups, V. Dehant, Chair of the Working Group ``Precession-nutation'', reported on the ITRS motion of the CIP corresponding to sub-diurnal nutations that have been recently examined by a sub-group of the WG chaired by A. Brzezinski. This group adopted a Table for operational use which has been provided in the IERS Conventions 2003. N. Capitaine gave a summary of the IAU Working Groups discussion that has been held on the equinox offset issue and explained how this offset has been taken into account in the actual implementation of the IAU 2000 precession-nutation.