## ››Convert light year to light day

 light-year light-day

How many light-year in 1 light-day? The answer is 0.0027378507871321.
We assume you are converting between light year and light day.
You can view more details on each measurement unit:
light-year or light-day
The SI base unit for length is the metre.
1 metre is equal to 1.0570008340246E-16 light-year, 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 light years and light days.
Type in your own numbers in the form to convert the units!

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

1 light-year to light-day = 365.25 light-day

2 light-year to light-day = 730.5 light-day

3 light-year to light-day = 1095.75 light-day

4 light-year to light-day = 1461 light-day

5 light-year to light-day = 1826.25 light-day

6 light-year to light-day = 2191.5 light-day

7 light-year to light-day = 2556.75 light-day

8 light-year to light-day = 2922 light-day

9 light-year to light-day = 3287.25 light-day

10 light-year to light-day = 3652.5 light-day

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

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## ››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).

## ››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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