The techniques of differential radio astrometry with a connected-element interferometer are presented. The motion of the compact, nonthermal radio source in the galactic center is found to be consistent with the secular parallax expected for an object at rest in the galactic center. The proper motion of PSR 1929+10 has been improved, and new limits on its trigonometric parallax are determined.
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Backer et al. (1982) studied this question.