  Analysis of Lunar Laser Ranging (LLR) data provides science results:
gravitational physics and ephemeris information from the orbit, lunar science
from rotation and solid-body tides, and Earth science. Sensitive tests of
gravitational physics include the Equivalence Principle, limits on the time
variation of the gravitational constant G, and geodetic precession. The
equivalence principle test is used for an accurate determination of the
parametrized post-Newtonian (PPN) parameter \beta. Lunar ephemerides are a
product of the LLR analysis used by current and future spacecraft missions. The
analysis is sensitive to astronomical parameters such as orbit, masses and
obliquity. The dissipation-caused semimajor axis rate is 37.9 mm/yr and the
associated acceleration in orbital longitude is -25.7 ''/cent^2, dominated by
tides on Earth with a 1% lunar contribution. Lunar rotational variation has
sensitivity to interior structure, physical properties, and energy dissipation.
The second-degree lunar Love numbers are detected; k_2 has an accuracy of 11%.
Lunar tidal dissipation is strong and its Q has a weak dependence on tidal
frequency. A fluid core of about 20% the Moon's radius is indicated by the
dissipation data. Evidence for the oblateness of the lunar
fluid-core/solid-mantle boundary is getting stronger. This would be independent
evidence for a fluid lunar core. Moon-centered coordinates of four
retroreflectors are determined. Station positions and motion, Earth rotation
variations, nutation, and precession are determined from analyses. Extending
the data span and improving range accuracy will yield improved and new
scientific results. Adding either new retroreflectors or precise active
transponders on the Moon would improve the accuracy of the science results.
