Also known as: au.
AU has various meanings in the Governmental & Military category. Discover the full forms, definitions, and usage contexts of AU in Governmental & Military.
The astronomical unit is a unit of length, roughly the distance from the Earth to the Sun. The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. The radius of the earth's orbit is defined as one astronomical unit.
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