How many astronomical unit in 1 light days? The answer is 173.14463267424. We assume you are converting between astronomical unit and light day. You can view more details on each measurement unit: astronomical unit or light days The SI base unit for length is the metre. 1 metre is equal to 6.6845871222684E-12 astronomical unit, or 3.8606955462749E-14 light days. 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!
1 astronomical unit to light days = 0.00578 light days
10 astronomical unit to light days = 0.05776 light days
50 astronomical unit to light days = 0.28878 light days
100 astronomical unit to light days = 0.57755 light days
200 astronomical unit to light days = 1.1551 light days
500 astronomical unit to light days = 2.88776 light days
1000 astronomical unit to light days = 5.77552 light days
You can do the reverse unit conversion from light days 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 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".
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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