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J. G. Williams, J. D. Anderson, D. H. Boggs, E. L. Lau, J. O. Dickey (JPL)
There is a three decade span of laser ranges to the Moon plus radar and spacecraft-derived ranges to the terrestrial planets. Analyses of the lunar and planetary data yield estimates of the rate of change of the gravitational constant G relative to G. Solutions using different data sets give uncertainties from 1.1x10-12 /yr to 1.8x10-12 /yr. The sensitivity increases quadratically with time, so future ranges will allow improved tests for the variation of G.