How many light seconds in 1 astronomical unit? The answer is 499.00478383616. We assume you are converting between light second and astronomical unit. You can view more details on each measurement unit: light seconds or astronomical unit The SI base unit for length is the metre. 1 metre is equal to 3.3356409519815E-9 light seconds, or 6.6845871222684E-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!
1 light seconds to astronomical unit = 0.002 astronomical unit
10 light seconds to astronomical unit = 0.02004 astronomical unit
50 light seconds to astronomical unit = 0.1002 astronomical unit
100 light seconds to astronomical unit = 0.2004 astronomical unit
200 light seconds to astronomical unit = 0.4008 astronomical unit
500 light seconds to astronomical unit = 1.00199 astronomical unit
1000 light seconds to astronomical unit = 2.00399 astronomical unit
You can do the reverse unit conversion from astronomical unit to light seconds, or enter any two units below:
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.
The astronomical unit (AU or au or a.u. or sometimes ua) is a unit of length defined to be exactly equal to 149,597,870,700 metres. Historically, the astronomical unit was conceived as the average Earth-Sun distance (the average of Earth's aphelion and perihelion), before its modern redefinition.
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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