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Abstract: Since VLBI techniques give microarcsecond position accuracy of celestialobjects, tests of GR using radio sources as probes of a gravitational fieldhave been made. We present the results from two recent tests using the VLBA: In2005, the measurement of the classical solar deflection; and in 2002, themeasurement of the retarded gravitational deflection associated with Jupiter.The deflection experiment measured PPN-gamma to an accuracy of 0.0003; theJupiter experiment measured the retarded term to 20% accuracy. The controversyover the interpretation of the retarded term is summarized.

Autor: E. Fomalont, S. Kopeikin



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