Abstract
Modern astrometry is based on angular measurements at the microarcsecond level. At this accuracy, a fully general relativistic treatment of the data reduction is required. This paper concludes a series of articles dedicated to the problem of relativistic light propagation, presenting the final, microarcsecond version of a relativistic astrometric model that enables us to trace back a light path to its source through the nonstationary gravitational field of the moving bodies in the solar system. The previous model is used as test bed for numerical comparisons with the present one. We also test different versions of the computer code implementing the model at different levels of complexity to start exploring the best trade-off between numerical efficiency and the microarcsecond accuracy that needs to be reached.
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