The past and present Earth-Moon system: the speed of light stays steady as tides evolve.

Planetary science Pub Date : 2014-01-01 Epub Date: 2014-04-04 DOI:10.1186/s13535-014-0002-5

James G Williams, Slava G Turyshev, Dale H Boggs

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引用次数: 35

Abstract

Tides induce a semimajor axis rate of +38.08 ± 0.19 mm/yr, corresponding to an acceleration of the Moon's orbital mean longitude of -25.82 ± 0.13 "/cent², as determined by the analysis of 43 yr of Lunar Laser Ranging (LLR) data. The LLR result is consistent with analyses made with different data spans, different analysis techniques, analysis of optical observations, and independent knowledge of tides. Plate motions change ocean shapes, and geological evidence and model calculations indicate lower rates of tidal evolution for extended past intervals. Earth rotation has long-term slowing due to tidal dissipation, but it also experiences variations for times up to about 10⁵ yr due to changes in the moment of inertia. An analysis of LLR data also tests for any rate of change in either the speed of light c or apparent mean distance. The result is (-2.8 ± 3.4)×10^-12 /yr for either scale rate or -(dc/dt)/c, or equivalently -1.0 ± 1.3 mm/yr for apparent distance rate. The lunar range does not reveal any change in the speed of light.

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过去和现在的地月系统:随着潮汐的演变，光速保持稳定。

潮汐引起的半长轴速率为+38.08±0.19 mm/yr，对应于月球轨道平均经度的加速度为-25.82±0.13”/cent2，这是43年月球激光测距(LLR)数据分析得出的结果。LLR结果与不同数据跨度、不同分析技术、光学观测分析和潮汐独立知识的分析结果一致。板块运动改变了海洋的形状，地质证据和模型计算表明，在过去较长的时间间隔内，潮汐演化的速率较低。由于潮汐耗散，地球自转长期缓慢，但由于惯性矩的变化，它也经历了长达105年的时间变化。对LLR数据的分析还测试了光速c或视平均距离的任何变化率。对于结垢率或-(dc/dt)/c，结果为(-2.8±3.4)×10-12 /yr，或等效的视距率为-1.0±1.3 mm/yr。月球的范围没有显示出光速的任何变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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