Astronomical unit
Mean distance between Earth and the Sun, common length reference in astronomy
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Astronomical unit
Mean distance between Earth and the Sun, common length reference in astronomy
The astronomical unit (symbol: au or AU) is a unit of length defined as 149597870700 m. Historically, the astronomical unit was conceived as the average Earth-Sun distance (the average of Earth's aphelion and perihelion), before its modern redefinition in 2012. The astronomical unit is used primarily for measuring distances within the Solar System or around other stars.
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From Wikipedia
The astronomical unit (symbol: au or AU) is a unit of length defined as 149597870700 m. Historically, the astronomical unit was conceived as the average Earth-Sun distance (the average of Earth's aphelion and perihelion), before its modern redefinition in 2012. 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. One au is approximately equivalent to 499 light-seconds.
Text: Wikipédia, CC BY-SA 4.0. · Image: Original: Huritisho Vector: Mrmw (CC BY-SA 4.0) ·
