Abstract
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,\({{\dot P} \mathord{\left/ {\vphantom {{\dot P} P}} \right. \kern-\nulldelimiterspace} P} = (5.0 \pm 2.7) \times 10^{ - 10} yr^{ - 1} \), 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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Goldstein, S.J. Deceleration of the Earth's rotation from old solar tables. Celestial Mechanics 27, 53–63 (1982). https://doi.org/10.1007/BF01228950
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DOI: https://doi.org/10.1007/BF01228950