NASA NTRS · 19920030320
Libration in the earth's rotation
Abstract
External luni-solar torque exerted on the difference (B-A) of the earth's two equatorial principal moments of inertia gives rise to two types of librational motions in the earth's rotation: the semidiurnal libration in spin and the prograde diurnal libration in polar motion. Formulas for the librations considering a realistic earth model and their tidal decompositions are derived and evaluated. The spin libration has a maximum peal-to-peak amplitude of 0.90 milliarcseconds, that of the polar libration is 0.06 milliarcseconds. Implications concerning their detectability and role in the tidal variation of earth rotation are discussed.
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Chao, B. F., Liu, H. S., Dong, D. N., Herring, T. A.. 1991-11-01. Libration in the earth's rotation. https://ntrs.nasa.gov/citations/19920030320
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