The Meaning of the Lunar Laser Ranging Experimental Results for Gravitational Theory

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The theoretical significance for gravitation of the lunar laser ranging experimental results (see Alley, 1982, in this volume, for a summary of these and for additional references) can be stated at several different conceptual levels. These include:

  1. a highly accurate Eötvüs experiment;

  2. “Gravity pulls on gravity;”

  3. measuring gravity’s non-linearity; and

  4. confirming General Relativity’s post-Newtonian gravitational vector potential and full non-linear potential.