## ››Convert astronomical unit to light day

 astronomical unit light day

How many astronomical unit in 1 light day? The answer is 173.14463268466.
We assume you are converting between astronomical unit and light day.
You can view more details on each measurement unit:
astronomical unit or light day
The SI base unit for length is the metre.
1 metre is equal to 6.6845871226706E-12 astronomical unit, or 3.8606955462749E-14 light day.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between astronomical units and light days.
Type in your own numbers in the form to convert the units!

## ››Quick conversion chart of astronomical unit to light day

1 astronomical unit to light day = 0.00578 light day

10 astronomical unit to light day = 0.05776 light day

50 astronomical unit to light day = 0.28878 light day

100 astronomical unit to light day = 0.57755 light day

200 astronomical unit to light day = 1.1551 light day

500 astronomical unit to light day = 2.88776 light day

1000 astronomical unit to light day = 5.77552 light day

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## ››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".

## ››Definition: Light-day

A light day (also written light-day) is a unit of length. It is defined as the distance light travels in an absolute vacuum in one day (of 86,400 seconds) or 25,902,068,371,200 metres (~26 Tm).

Note that this value is exact, since the metre is actually defined in terms of the speed of light. The light day isn't very frequently used at all since there are few astronomical objects or distances of that magnitude; the Oort cloud, for example, is thought to extend between 290 and 580 light-days out from the Sun.

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