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 Science Quote'Physics is mathematical not because we know so much about the physical world, but because we know so little; it is only its mathematical properties that we can discover.'
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