## ››Convert light day to millimetre

 light-day millimeter

How many light-day in 1 millimeter? The answer is 3.8606955462749E-17.
We assume you are converting between light day and millimetre.
You can view more details on each measurement unit:
light-day or millimeter
The SI base unit for length is the metre.
1 metre is equal to 3.8606955462749E-14 light-day, or 1000 millimeter.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between light days and millimetres.
Type in your own numbers in the form to convert the units!

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

1 light-day to millimeter = 2.59020683712E+16 millimeter

2 light-day to millimeter = 5.18041367424E+16 millimeter

3 light-day to millimeter = 7.77062051136E+16 millimeter

4 light-day to millimeter = 1.036082734848E+17 millimeter

5 light-day to millimeter = 1.29510341856E+17 millimeter

6 light-day to millimeter = 1.554124102272E+17 millimeter

7 light-day to millimeter = 1.813144785984E+17 millimeter

8 light-day to millimeter = 2.072165469696E+17 millimeter

9 light-day to millimeter = 2.331186153408E+17 millimeter

10 light-day to millimeter = 2.59020683712E+17 millimeter

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

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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: Millimeter

A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre, which is the International System of Units (SI) base unit of length. The millimetre is part of a metric system. A corresponding unit of area is the square millimetre and a corresponding unit of volume is the cubic millimetre.

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