## ››Convert light second to astronomical unit

 light-second astronomical unit

How many light-second in 1 astronomical unit? The answer is 499.00478380614.
We assume you are converting between light second and astronomical unit.
You can view more details on each measurement unit:
light-second or astronomical unit
The SI base unit for length is the metre.
1 metre is equal to 3.3356409519815E-9 light-second, or 6.6845871226706E-12 astronomical unit.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between light seconds and astronomical units.
Type in your own numbers in the form to convert the units!

## ››Quick conversion chart of light-second to astronomical unit

1 light-second to astronomical unit = 0.002 astronomical unit

10 light-second to astronomical unit = 0.02004 astronomical unit

50 light-second to astronomical unit = 0.1002 astronomical unit

100 light-second to astronomical unit = 0.2004 astronomical unit

200 light-second to astronomical unit = 0.4008 astronomical unit

500 light-second to astronomical unit = 1.00199 astronomical unit

1000 light-second to astronomical unit = 2.00399 astronomical unit

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You can do the reverse unit conversion from astronomical unit to light-second, or enter any two units below:

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## ››Definition: Light-second

A light-second is a unit of length. It is defined as the distance light travels in an absolute vacuum in one second or 299,792,458 meters. Note that this value is considered exact, since the meter is actually (as of 1983) defined in terms of the light second. It is just over 186,282 miles and almost 109 feet.

## ››Definition: Astronomical unit

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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