How many astronomical unit in 1 light-second?
The answer is 0.0020039888042206.

We assume you are converting between **astronomical unit** and **light second**.

You can view more details on each measurement unit:

astronomical unit or
light-second

The SI base unit for **length** is the metre.

1 metre is equal to 6.6845871226706E-12 astronomical unit, or 3.3356409519815E-9 light-second.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between astronomical units and light seconds.

Type in your own numbers in the form to convert the units!

1 astronomical unit to light-second = 499.00478 light-second

2 astronomical unit to light-second = 998.00957 light-second

3 astronomical unit to light-second = 1497.01435 light-second

4 astronomical unit to light-second = 1996.01914 light-second

5 astronomical unit to light-second = 2495.02392 light-second

6 astronomical unit to light-second = 2994.0287 light-second

7 astronomical unit to light-second = 3493.03349 light-second

8 astronomical unit to light-second = 3992.03827 light-second

9 astronomical unit to light-second = 4491.04305 light-second

10 astronomical unit to light-second = 4990.04784 light-second

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

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 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.

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