Sergei+Klioner

The boost of the accuracy of astrometric observations makes it indispensable to use general theory of relativity to model and process the observational data. At the level of accuracy of 1 microarcsecond it is impossible to interpret the data in a purely Newtonian way. Moreover, such an accuracy requires a high level of consistency between various parts of data processing chain. In this talk the relativistic modelling for microarcsecond astrometry will be reviewed. All the effects which enter the relativistic model can be in turn used to test relativity. An overview of various possible relativistic tests to be realized with future microarcsecond astrometric data will be also given.
 * Relativity and astrometry in the microarcsecond level **
 * S. A. Klioner, Lohrmann Observatory, Dresden Technical University **