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To establish definitions and conventions to provide a coherent relativistic frame for all activities in space-time references and metrology at a sufficient level of uncertainty, to establish a uniform system of notations for quantities and units, and to develop the adopted definitions and conventions for practical application by the user. The IAU has also endorsed under its Division 1 (Fundamental Astronomy) the continuation of the Working Group on Relativity in celestial mechanics and astrometry (RCMA) and the two groups should work in close cooperation.


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