Astronomical unit | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-25

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Astronomical_unit


00:00:47 1 History of symbol usage
00:01:47 2 Development of unit definition
00:06:44 3 Usage and significance
00:07:29 4 History
00:09:40 5 Developments
00:13:13 6 Examples
00:23:24 7 See also
00:25:13 8 References
00:25:41 9 Further reading



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SUMMARY
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The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun. However, that distance varies as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, since 2012 it has been defined as exactly 149597870700 metres or about 150 million kilometres (93 million miles). The astronomical unit is used primarily for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another unit of astronomical length, the parsec.