Astronomical unit
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| definition | A unit of length equal to 149,597,870,700 m exactly, with symbol 'au' (re-definition at the International Astronomical Union's 28th General Assembly in Beijing, China, August 20-31). The astronomical unit equals 1.5813 x 10^-5 light-years and 4.8481 x 10^-6 parsecs. | ||||||
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| contributor | AAS_Frey.Katie_Admin original | ||||||