## ››Convert light day to micrometre

 light-day micrometer

 Did you mean to convert light-day to micrometre micron

How many light-day in 1 micrometer? The answer is 3.8606955462749E-20.
We assume you are converting between light day and micrometre.
You can view more details on each measurement unit:
light-day or micrometer
The SI base unit for length is the metre.
1 metre is equal to 3.8606955462749E-14 light-day, or 1000000 micrometer.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between light days and micrometres.
Type in your own numbers in the form to convert the units!

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

1 light-day to micrometer = 2.59020683712E+19 micrometer

2 light-day to micrometer = 5.18041367424E+19 micrometer

3 light-day to micrometer = 7.77062051136E+19 micrometer

4 light-day to micrometer = 1.036082734848E+20 micrometer

5 light-day to micrometer = 1.29510341856E+20 micrometer

6 light-day to micrometer = 1.554124102272E+20 micrometer

7 light-day to micrometer = 1.813144785984E+20 micrometer

8 light-day to micrometer = 2.072165469696E+20 micrometer

9 light-day to micrometer = 2.331186153408E+20 micrometer

10 light-day to micrometer = 2.59020683712E+20 micrometer

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You can do the reverse unit conversion from micrometer 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: Micrometer

A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the size of a droplet of mist or fog. It is also commonly known as a micron, although that term is officially outdated. It can be written in the expanded mathmatical notation (1×10-6 m)

The symbol µ is the "micro sign", which should look identical to the Greek letter mu (?) (the two may or may not look the same, depending on the font). The symbol "um" is sometimes used, when the µ and ? are not available, for example when using a typewriter.

The micrometre is a common unit of measurement for wavelengths of infrared radiation. Some people (especially in astronomy and the semiconductor business) use the old name micron and/or the solitary symbol µ (both of which were official between 1879 and 1967) to denote a micrometre. This practice persists in the face of official discouragement, perhaps to help disambiguate between the unit of measurement and the micrometer, a measuring device.

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