How many square kilometer in 1 square astronomical unit? The answer is 2.2379523E+16. We assume you are converting between square kilometre and square astronomical unit. You can view more details on each measurement unit: square kilometer or square astronomical unit The SI derived unit for area is the square meter. 1 square meter is equal to 1.0E-6 square kilometer, or 4.4683704831421E-23 square astronomical unit. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between square kilometers and square astronomical units. Type in your own numbers in the form to convert the units!
You can do the reverse unit conversion from square astronomical unit to square kilometer, or enter any two units below:
A square astronomical unit is defined as the area of a square with sides one astronomical unit in length.
The definition of a astronomical unit is as follows:
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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