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Measurement unit conversion: astronomical unit
Full name: astronomical unit
Plural form: astronomical units
Symbol: AU
Category type: length
Scale factor: 149597870691
The SI base unit for length is the metre.
1 metre is equal to 6.68458712267E-12 astronomical unit.
Valid units must be of the length type.
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The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length. It is approximately equal to the mean distance between the Earth and Sun. The currently accepted value of the AU is 149 597 870 691 ± 30 metres (about 150 million kilometres or 93 million miles).
The symbol "ua" is recommended by the Bureau International des Poids et Mesures, but in the United States and other anglophone countries the reverse usage is more common. The International Astronomical Union recommends "au" and international standard ISO 31-1 uses "AU".
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