Source: wikibot/fizeau-s-measurement-of-the-speed-of-light-in-air
= Fizeau's measurement of the speed of light in air
{wiki=Fizeau's_measurement_of_the_speed_of_light_in_air}
Hippolyte Fizeau's experiment in 1849 was one of the first successful measurements of the speed of light. He measured the speed of light in air to be approximately 313,000 kilometers per second (km/s). This value is quite close to the currently accepted speed of light in vacuum, which is about 299,792 km/s.