## Convert thou to light day

 thou light-day

How many thou in 1 light-day? The answer is 1.0197664713071E+18. We assume you are converting between thou and light day. You can view more details on each measurement unit: thou or light-day The SI base unit for length is the metre. 1 metre is equal to 39370.078740157 thou, 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 thou and light days. Type in your own numbers in the form to convert the units!

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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.

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