Speed of light measurement

Galileo Galilei

Jan 1, 1600

Method: Lanterns
Speed: "fast"

R0mer/Huygens

Jan 1, 1676

Method:Jovian moon occultation
Speed:215,000 km/s

Bradley

Jan 1, 1729

Method: Aberration of Light
Speed: 301,000 km/s

Fizeau

Jan 1, 1849

Method: Spinning slotted wheel
Speed: 315,300 km/s

Michelson

Jan 1, 1879

Method: Rotating mirror
Speed: 299,910 km/s

Rosa

Jan 1, 1889

Method: Capacities method
Speed: 300,000 km/s

Comstock

Jan 1, 1890

Method: 18 star pairs
Speed: 300,560 km/s

Perot/Fabry

Jan 1, 1898

Method: Electromanetic method
Speed: 299,730 km/s

Rosa/Dorsey

Jan 1, 1906

Method: Electrical method
Speed: 299,700 km/s

Mercier

Jan 1, 1923

Method: Electrical measurements
Speed: 299,700 km/s

Michelson/ Birge

Jan 1, 1926

Method: Interferometer
Speed: 299,798 km/s

Karolus/Mittelstaedt

Jan 1, 1928

Method: Kerr Cell shutter
Speed: 299,778 km/s

Pease/Pearson

Jan 1, 1932

Method: Interferometer
Speed: 299,774 km/s

Essen/Gordon-Smith

Jan 1, 1947

Method: Microwave Cavity
Speed: 299,792 km/s

Froome

Jan 1, 1958

Method: Interferometer
Speed: 299,792.50 km/s

Evenson

Jan 1, 1973

Method: Laser method
Speed: 299,792.467 km/s

Woods/Shotton/Rowley

Jan 1, 1978

Method: Laser method
Speed: 299,792.4588 km/s

International

Jan 1, 1983

Method: Definition
Speed: 299,792.458 km/s