Deceleration of the earth's rotation from old solar tables

Computer Science

Scientific paper

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Deceleration, Earth Rotation, Solar Longitude, Tables (Data), Earth-Moon System, Lunar Tides, Moments Of Inertia, Solar Terrestrial Interactions, Torque

Scientific paper

The solar tables of ibn Yunis and of King Alfonso, those of Kepler, of G. D. and J.-J. Cassini, and of Lalande are compared with Newcomb's theory of the sun to determine the deceleration of the earth's rotation. Comparisons of mean motion and of longitude lead to separate determinations. A value for the deceleration, (5.0 + or - 2.7) x 10 to the -10/yr, assumed to be independent of time is obtained for the period - 146 through 1892. This result is based on the assumption that Newcomb's theory converts the earth's orbital motion into a perfect clock, and the result is independent of lunar and tidal theory. The deceleration seems greater than that obtained from the literature for the tidal deceleration caused by the moon.

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