Convert kilometer to astronomical unit
Please provide values below to convert kilometer [km] to astronomical unit [AU, UA], or Convert astronomical unit to kilometer.
How to Convert Kilometer to Astronomical Unit
1 km = 6.68458712226845e-09 AU, UA
Example: convert 15 km to AU, UA:
15 km = 15 × 6.68458712226845e-09 AU, UA = 1.00268806834027e-07 AU, UA
Kilometer to Astronomical Unit Conversion Table
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Kilometer
A kilometer is a unit of length in the metric system, equal to one thousand meters.
History/Origin
The term "kilometer" is derived from the Greek words "khilioi" (thousand) and "metron" (measure). The kilometer was first defined as part of the metric system in France in 1795.
Current Use
The kilometer is the most widely used unit of distance for road signs and travel distances in the world, with the notable exceptions of the United States and the United Kingdom.
Astronomical Unit
The astronomical unit is a unit of length, now defined as exactly 149,597,870,700 meters. It is approximately the average distance between the Earth and the Sun.
History/Origin
Historically, the astronomical unit was the mean Earth-Sun distance. In 2012, the International Astronomical Union (IAU) redefined it as a fixed constant.
Current Use
The astronomical unit is used primarily for measuring distances within the Solar System or around other stars.