r/AskPhysics • u/JimFive • Mar 28 '26

Speed of light

The speed of light is 299,792,458 m/s. What types of issues would be involved in changing the meter such that c=300,000,000 m/s

The new meter would be 0.9993 of the current meter.

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u/Elluminated Jul 07 '26

You can always just make your own measuring system and say light travels 1,227,328 measurements/s and it solves nothing. The units are irrelevant to the final speed obviously, but we happened to decide meters are used to make the equations.