Manuals/calci/SPEEDOFLIGHT

SPEEDOFLIGHT (Units)

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- SPEEDOFLIGHT(), returns the speed of light per year.

Description

This function shows the value of speed of light.
The speed of light value is Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle 29979245800 m s^{-1}} .
The approximate value is approximately .
It is exact because the unit of length, the meter, is defined from this constant and the international standard for time.
Speed of light is the distance of light which can travel in a unit of time through a given substance.
Speed of light in vacuum is denoted by c.
The speed at which light propagates through transparent materials, such as glass or air, is less than c.
Similarly, the speed of radio waves in wire cables is slower than c.
A light year, or the distance light can travel in a year, is over five trillion miles.
Light from the sun takes about eight minutes to reach the Earth.
Speed of light is mainly used in Einstein's formula Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle E=mc^2} .