![]() ![]() The mean distance, over land, between opposite sides of the Earth is about 66.8 light-milliseconds.One light-microsecond is about 300 meters.One light-nanosecond is almost 300 millimeters (about 299.8 mm, 5 mm less than one foot), which limits the speed of data transfer between different parts of a large computer.Use in telecommunications Ĭommunications signals on Earth rarely travel at precisely the speed of light in free space, but distances in fractions of a light-second are still useful for planning telecommunications networks as they indicate the minimum possible delay between sender and receiver. This definition fixes the speed of light in vacuum at exactly 299 792 458 m/s, and hence the light-second at exactly 299,792,458 m. The meter is the length of the path traveled by light in vacuum during a time interval of 1∕ 299 792 458 of a second. 4 Distance units based on the speed of light.The more commonly-used light-year is also presently defined to be equal to precisely 31 557 600 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 86 400 SI seconds. or imperial foot) to the light-minute, light-hour, and light-day, which are sometimes used in popular science publications. 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 (just under one U.S. It is just over 186,000 miles and almost 10 9 feet. ![]() It is defined as the distance that light travels in free space in one second, and is equal to exactly 299,792,458 meters. As with the Units of Measurement Wiki, the text of Wikipedia is available under Creative Commons License see Wikia:Licensing.Ī light-second is a unit of length useful in astronomy, telecommunications, and relativistic physics. The list of authors can be seen in the page history. The original article was at Light-second. This page uses content from the English Wikipedia. ![]()
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