Light-day | Wikipedia audio article
Channel: wikipedia tts
Date: 05/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Light-second


00:00:59 1 Use in telecommunications
00:02:15 2 Use in astronomy
00:03:40 3 See also



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SUMMARY
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The light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in one second, and is equal to exactly 299,792,458 metres (983,571,056 ft).
Just as the second forms the basis for other units of time, the light-second can form the basis for other units of length, ranging from the light-nanosecond (299.8 mm or just under one international foot) to the light-minute, light-hour and light-day, which are sometimes used in popular science publications. The more commonly used light-year is also presently defined to be equal to precisely 31557600 light-seconds, since the definition of a year is based on a Julian year (not Gregorian year) of exactly 365.25 days, each of exactly 86400 SI seconds.