Titlebook: Dynamics and Astrometry of Natural and Artificial Celestial Bodies; Proceedings of IAU C I. M. Wytrzyszczak,J. H. Lieske,R. A. Feldman Conf

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Lunar Motion: Theory and ObservationsResults of several fits of the lunar theory ELP 2000-82B and of Moons’ theory of libration are presented. The theories are fitted both to JPL numerical integrations and to LLR observations.

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Estimation of the Lunar Physical Librationssubset of this span produced estimates of the component frequencies of the forced and free librations. A subsequent iterative least-squares estimation procedure provided precise values for phases and for time-varying amplitudes and frequencies. Two free libration modes were found; presence of a thir

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On Hamiltonian Averaging Theories and Resonanceical systems with several degrees of freedom and one resonant critical angle. The essential modification is the comparison of the series terms according to the degree of homogeneity in both . and a parameter which measures the distance from the exact resonance, instead of just ..

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The Future of Artificial Satellite Theoriescal understanding of the motion and the practical desire to be able to produce a computational result. Only with the advent of the computer did numerical integration become a practical consideration for solving dynamical problems. Although computer technology is not yet to the point of being able to