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The lunar-ranging test of the equivalence principle for gravitational self-energy is ambiguous. Although the Earth has more gravitational self-energy than the Moon, its sizable Fe/Ni core also gives it a different composition than the Moon. We removed this ambiguity by comparing, in effect, the accelerations of ``miniature'' earths and moons toward the Sun. Our composition-dependent Earth-Moon acceleration, a₂₃/aₒ0ex{0ex}=0ex{0ex} (+0. 12. 71. 7) 10^-13, and lunar-ranging data provide an unambiguous test at the 1. 310^-3 level.
Baeßler et al. (Mon,) studied this question.
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