Earth's axis | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-14

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Axial_tilt


00:00:53 1 Standards
00:01:29 2 Earth
00:02:13 2.1 History
00:03:30 2.2 Seasons
00:04:09 2.3 Oscillation
00:04:17 2.3.1 Short term
00:06:29 2.3.2 Long term
00:07:22 3 Solar System bodies
00:08:54 4 Extrasolar planets
00:10:46 5 See also
00:11:45 6 References



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SUMMARY
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In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane. It differs from orbital inclination.
At an obliquity of 0 degrees, the two axes point in the same direction; i.e., the rotational axis is perpendicular to the orbital plane. Earth's obliquity oscillates between 22.1 and 24.5 degrees on a 41,000-year cycle; Earth's mean obliquity is currently 23°26′12.4″ (or 23.43677°) and decreasing.
Over the course of an orbital period, the obliquity usually does not change considerably, and the orientation of the axis remains the same relative to the background of stars. This causes one pole to be directed more toward the Sun on one side of the orbit, and the other pole on the other side—the cause of the seasons on Earth.