## ››Convert light day to astronomical unit

 light-day astronomical unit

## ››More information from the unit converter

How many light-day in 1 astronomical unit? The answer is 0.0057755183310895.
We assume you are converting between light day and astronomical unit.
You can view more details on each measurement unit:
light-day or astronomical unit
The SI base unit for length is the metre.
1 metre is equal to 3.8606955462749E-14 light-day, 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 days and astronomical units.
Type in your own numbers in the form to convert the units!

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

1 light-day to astronomical unit = 173.14463 astronomical unit

2 light-day to astronomical unit = 346.28927 astronomical unit

3 light-day to astronomical unit = 519.4339 astronomical unit

4 light-day to astronomical unit = 692.57853 astronomical unit

5 light-day to astronomical unit = 865.72316 astronomical unit

6 light-day to astronomical unit = 1038.8678 astronomical unit

7 light-day to astronomical unit = 1212.01243 astronomical unit

8 light-day to astronomical unit = 1385.15706 astronomical unit

9 light-day to astronomical unit = 1558.30169 astronomical unit

10 light-day to astronomical unit = 1731.44633 astronomical unit

## ››Want other units?

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

## Enter two units to convert

 From: To:

## ››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.

## ››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".

## ››Metric conversions and more

ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 100 kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!