The free librations of a dissipative Moon

摘要: It is noted that dissipation in the moon produces a small offset (approximately 0.23 arcsec) of moon's rotation axis from plane defined by ecliptic and lunar orbit normals. Both solid body tidal friction viscous fluid at core-mantle interface are thought to be plausible mechanisms. The merits both discussed, it found requires low Q 28), whereas turbulent core with radius approximately 330 km cause signature observed laser ranging. Large 0.4-8.0 free librations figure have also been detected through very recent impact on turbulence considered mechanisms for generating these librations.