›› Convert light day to light year


›› More information from the unit converter

How many light-day in 1 light-year? The answer is 365.25.
We assume you are converting between light day and light year.
You can view more details on each measurement unit:
light-day or light-year
The SI base unit for length is the metre.
1 metre is equal to 3.8606955462749E-14 light-day, or 1.0570008340246E-16 light-year.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between light days and light years.
Type in your own numbers in the form to convert the units!

›› Quick conversion chart of light-day to light-year

1 light-day to light-year = 0.00274 light-year

10 light-day to light-year = 0.02738 light-year

50 light-day to light-year = 0.13689 light-year

100 light-day to light-year = 0.27379 light-year

200 light-day to light-year = 0.54757 light-year

500 light-day to light-year = 1.36893 light-year

1000 light-day to light-year = 2.73785 light-year

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

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›› Common length conversions

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›› 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: Light-year

A light year, abbreviated ly, is the distance light travels in one year: roughly 9.46 × 1012 kilometres (9.46 petametres, or about 5.88 × 1012 (nearly six trillion) miles). More specifically, a light year is defined as the distance that a photon would travel, in free space and infinitely far away from any gravitational or magnetic fields, in one Julian year (365.25 days of 86400 seconds each).

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