The Journées 2007 "Systèmes de référence spatio-temporels" (JSR2007) will be held from 17 to 19 September 2007 at Paris Observatory, on its Meudon site, France (see the practical information). They have received the support of Paris Observatory Scientific Council and the Department SYRTE.

The main purpose of these international meetings is to provide a forum for discussion of researchers in the fields of celestial and terrestrial reference systems, Earth rotation, astrometry and time.

The Journées 2007 will be focused on the issues related to the recent developments, perspectives of future realizations and scientific applications of the celestial reference frame.

The Journées 2007 are organized in conjunction with the IERS Workshop on Conventions, to be held on 20-21 September 2007 at BIPM (Sèvres, France).
(For those attending both the Journées 2007 and the IERS Workshop, see the specific information regarding accomodation in the practical information.)

Scientific Organizing Commitee: A. Brzezinski, Poland, N. Capitaine, France (Chair), P. Defraigne, Belgium, T. Fukushima, Japan, D.D. McCarthy, USA, M. Soffel, Germany, J. Vondrák, Czech, R. Ya. Yatskiv, Ukraine

Local Organizing Commitee: Daniel Gambis (Chair), Pascale Baudoin, Olivier Becker, Christian Bizouard, Sébastien Bouquillon, Liliane Garin, Anne-Marie Gontier, Sébastien Lambert, Jean Souchay