Tidal acceleration | Wikipedia audio article
Channel: wikipedia tts
Date: 04/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Tidal_acceleration


00:00:55 1 Earth–Moon system
00:01:05 1.1 Discovery history of the secular acceleration
00:04:42 1.2 Effects of Moon's gravity
00:09:03 1.3 Angular momentum and energy
00:12:31 1.4 Historical evidence
00:13:47 1.5 Quantitative description of the Earth–Moon case
00:16:55 2 Other cases of tidal acceleration
00:18:17 3 Tidal deceleration
00:19:03 4 Theory
00:19:33 4.1 Size of the tidal bulge
00:19:42 4.2 Torque
00:23:14 4.3 Relation of the lag angle to energy dissipation
00:29:42 4.4 Retardation of the planet's rotation
00:39:14 4.5 Effect on the satellite motion around the planet
00:40:02 4.6 Effect of the Sun
00:42:41 4.7 A detailed calculation for the earth - moon system
00:43:07 4.7.1 Potential perturbation created by the moon on earth
00:48:37 4.7.2 Form of the bulge I: response to a perturbative potential
00:54:38 4.7.3 Form of the bulge II: the deformation creating a perturbative potential
00:54:49 4.7.4 Calculation of the torque
01:02:55 5 See also
01:10:52 6 References
01:24:14 7 External links
01:24:28 0.38, roughly twice the density ratios of 0.18).
01:24:36 Calculation of the torque
01:33:06 See also



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SUMMARY
=======
Tidal acceleration is an effect of the tidal forces between an orbiting natural satellite (e.g. the Moon), and the primary planet that it orbits (e.g. Earth).  The acceleration causes a gradual recession of a satellite in a prograde orbit away from the primary, and a corresponding slowdown of the primary's rotation. The process eventually leads to tidal locking, usually of the smaller first, and later the larger body. The Earth–Moon system is the best studied case.
The similar process of tidal deceleration occurs for satellites that have an orbital period that is shorter than the primary's rotational period, or that orbit in a retrograde direction.
The naming is somewhat confusing, because the speed of the satellite relative to the body it orbits is decreased as a result of tidal acceleration, and increased as a result of tidal deceleration.