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Convert astronomical unit to kilometre - Conversion of Measurement Units
How many astronomical unit in 1 kilometre?
The answer is 6.68458712267E-9.
We assume you are converting between astronomical unit and kilometre.
You can view more details on each measurement unit:
astronomical unit or
kilometre
The SI base unit for length is the metre.
1 metre is equal to 6.68458712267E-12 astronomical unit, or 0.001 kilometre.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between astronomical units and kilometers.
Type in your own numbers in the form to convert the units!
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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".
A kilometre (American spelling: kilometer, symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet.
ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 100 kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!
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