ASTRONOMICALUNIT

Astronomical unit

An astronomical unit is a unit of length now defined as exactly  m, or roughly the average Earth–Sun distance.

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astronomical unit

Noun

  1. The mean distance from the Earth to the Sun (the semi-major axis of Earth's orbit), approximately 149,600,000 kilometres (symbol AU), used to measure distances in the solar system.


The above text is a snippet from Wiktionary: astronomical unit
and as such is available under the Creative Commons Attribution/Share-Alike License.

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