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3. Tides on the MoonLUNAR MOMENTS, TIDES, ORIENTATION, AND COORI)lNATE FRAMES
The attraction of the Earth raises solid-body tides on the Moon. The
Moon keeps
one face toward the Earth, but there are still time-varying tides due to
0.1 radian
variations in the apparent direction of the Earth (both latitude and
longitude) and
variation in the distance. The time-varying radial tidal displacement is
about 0.1 m,
Each of the three causes has a 0.1 m maximum effect at a different
location on the Moon.
The two dominant periods are 27,55 d (period of mean anomaly) and 27.21 d
(period of
node crossings). This is large enough to affect the Lunar Laser Ranging
data and is accounted for in the analysis, but it is less of a concern
for altimetry.
James G. Williams, X X Ncwhall, and Jean O. Dickey
Jet Propulsion Laboratory, California Institule of Technology, Pasadena,
CA,911 09, USA
jgw@logos.jpl.nasa. gov
Pete Lohstreter Happy is he who gets to know the
reasons for things.
The Hockaday School Virgil
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