Physics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phdt........19g&link_type=abstract
Ph.D. Thesis - Catholic Univ. of America National Geodetic Survey, Rockville, MD.
Physics
Digital Filters, Earth Gravitation, Geodetic Satellites, Tides, Harmonic Functions, Signal Processing, Spherical Harmonics
Scientific paper
The results and techniques used to estimate a nonstationary variation in the Earth's gravity field, the principal lunar semi-diurnal (M2) ocean tide, is given. Estimates of two coefficients in the harmonic expansion of the M2 global tide height were obtained. Application of the coefficients to the problem of deceleration of the lunar mean longitude yields an estimate of -27.4 arc seconds/century 2 which is in close agreement with recent analyses of ancient eclipses and modern transit data. It can be inferred that the solid tide phase lag must be less than 1 degree because the entire deceleration of the lunar mean longitude can be accounted for by the ocean tide model obtained in this study.
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