= James G. Williams
{c}
A researcher in <lunar laser ranging> and tests of <gravity>. With <Slava G. Turyshev> and <Dale Boggs>, he analyzed whether <Earth> and the <Moon> fall toward the <Sun> at the same rate. Timing <laser> pulses reflected by lunar <retroreflectors> turns the Earth–Moon system into an experiment on the <equivalence principle>.<Lunar Laser Ranging Tests of the Equivalence Principle by James G. Williams and others>[Author affiliation; abstract and §2: ranging apparatus and equivalence-principle test]{ref}
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