Question

How we can measure the speed of light ?

Answer 1

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Answer 2

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The official definition of a meter today is: 1⁄299792458 of the distance travelled by light in a vacuum, in 1 second. ... A consequence of using this definition is that any attempt to measure the speed of light is cyclical; you must use a “meter” to measure it at some point, which relies on the speed of light.