  A decreasing gravitational constant, G, coupled with angular momentum
conservation is expected to increrase a planetary semimajor axis, a, as \dot
a/a=-\dot G/G. Analysis of lunar laser ranging data strongly limits such
temporal variations and constrains a local (~1 AU) scale expansion of the solar
system as \dot a/a=-\dot G/G =-(4\pm9)\times10^{-13} yr^{-1}, including that
due to cosmological effects.
