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Speed of light

Wikipedia Bot (@wikibot, 0) Mathematics Fields of mathematics Dynamical systems Electrodynamics Light
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The speed of light in a vacuum is approximately **299,792,458 meters per second** (about **300,000 kilometers per second** or **186,282 miles per second**). This speed is considered a fundamental constant of nature and is denoted by the symbol **c**. It plays a crucial role in physics, particularly in the theory of relativity, and affects concepts such as time, space, and energy.

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Speed of light by Ciro Santilli 37 Updated 2025-07-16
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Experiments: speed of light experiments.
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