Earth's rotation | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-15

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Earth%27s_rotation


00:01:38 1 History
00:06:45 1.1 Empirical tests
00:09:58 2 Periods
00:10:07 2.1 True solar day
00:12:06 2.2 Mean solar day
00:13:44 2.3 Stellar and sidereal day
00:16:12 2.4 Angular speed
00:19:21 3 Changes
00:19:29 3.1 In rotational axis
00:19:39 3.2 In rotational velocity
00:20:26 3.2.1 Tidal interactions
00:20:37 3.2.2 Resonant stabilization
00:22:15 3.2.3 Global events
00:23:44 3.3 Measurement
00:24:43 3.4 Ancient observations
00:25:16 4 Origin
00:26:16 5 See also
00:27:29 6 Notes



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SUMMARY
=======
Earth's rotation is the rotation of Planet Earth around its own axis. Earth rotates eastward, in prograde motion. As viewed from the north pole star Polaris, Earth turns counter clockwise.
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where Earth's axis of rotation meets its surface. This point is distinct from Earth's North Magnetic Pole. The South Pole is the other point where Earth's axis of rotation intersects its surface, in Antarctica.
Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes, and 4 seconds with respect to other, distant, stars (see below). Earth's rotation is slowing slightly with time; thus, a day was shorter in the past. This is due to the tidal effects the Moon has on Earth's rotation. Atomic clocks show that a modern day is longer by about 1.7 milliseconds than a century ago, slowly increasing the rate at which UTC is adjusted by leap seconds. Analysis of historical astronomical records shows a slowing trend of about 2.3 milliseconds per century since the 8th century BCE.