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[en] Results are presented from the analysis of solar system astrometric data, notably the range data to the Viking landers on Mars. A least-squares fit of the parameters of the solar system model to these data limits a simple time variation in the effective Newtonian gravitational constant to (0.2 +- 0.4) x 10-11 yr-1 and a rate of drift of atomic clocks relative to the implicit clock of relativistic dynamics to (0.1 +- 0.8) x 10-11 yr-1. The error limits quoted are the result of uncertainties in the masses of the asteroids
Journal
Physical Review Letters; ISSN 0031-9007; 
; v. 51(18); p. 1609-1612
; v. 51(18); p. 1609-1612