## ››Convert femtometre to light day

 femtometer light day

 Did you mean to convert femtometre fermi to light day

How many femtometer in 1 light day? The answer is 2.59020683712E+28.
We assume you are converting between femtometre and light day.
You can view more details on each measurement unit:
femtometer or light day
The SI base unit for length is the metre.
1 metre is equal to 1.0E+15 femtometer, 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 femtometers and light days.
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You can do the reverse unit conversion from light day to femtometer, or enter any two units below:

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## ››Definition: Femtometre

The SI prefix "femto" represents a factor of 10-15, or in exponential notation, 1E-15.

So 1 femtometre = 10-15 metre.

## ››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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