|Date||Investigator||Method||Result (km/s) (Error)|
|1849||Fizeau||Rotating toothed wheel||313,000 (5000)|
|1850||Foucault||Rotating mirror||298,000 (2000)|
|1875||Cornu||Rotating mirror||299,990 (200)|
|1880||Michelson||Rotating mirror||2990,910 (159)|
|1883||Newcomb||Rotating mirror||299,860 (30)|
|1928||Mittelstaedt||Kerr cell shutter||299,778 (10)|
|1932||Pease and Pearson||Rotating mirror||299,774 (2)|
|1940||Huttel||Kerr cell shutter||299,768 (10)|
|1951||Bergstrand||Kerr cell shutter||299,793.1 (0.3)
Reference: 'Introduction to Modern Optics, by Grant R. Fowles, Dover Publications, NYC, 1989, p6
Answered by: I would like to add that the speed of light has finally been defined to be 299 792 458 m/s, exactly. This is done since we believe c to be a true constant of nature. So, now, the definition of the meter is directly dependent on the definition
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