Speed of Light - History

History

History of measurements of c (in km/s)
1675 Rømer and Huygens, moons of Jupiter 220,000
1729 James Bradley, aberration of light 301,000
1849 Hippolyte Fizeau, toothed wheel 315,000
1862 Léon Foucault, rotating mirror 298,000±500
1907 Rosa and Dorsey, EM constants 299,710±30
1926 Albert Michelson, rotating mirror 299,796±4
1950 Essen and Gordon-Smith, cavity resonator 299,792.5±3.0
1958 K.D. Froome, radio interferometry 299,792.50±0.10
1972 Evenson et al., laser interferometry 299,792.4562±0.0011
1983 17th CGPM, definition of the metre 299,792.458 (exact)

Until the early modern period, it was not known whether light travelled instantaneously or at a very fast finite speed. The first extant recorded examination of this subject was in ancient Greece. The ancient Greeks, Muslim scholars and classical European scientists long debated this until Rømer provided the first calculation of the speed of light. Einstein's Theory of Special Relativity concluded that the speed of light is constant regardless of one's frame of reference. Since then, scientists have provided increasingly accurate measurements.

Read more about this topic:  Speed Of Light

Other articles related to "history":

Spain - History - Fall of Muslim Rule and Unification
... The breakup of Al-Andalus into the competing taifa kingdoms helped the long embattled Iberian Christian kingdoms gain the initiative ... The capture of the strategically central city of Toledo in 1085 marked a significant shift in the balance of power in favour of the Christian kingdoms ...
Xia Dynasty - Modern Skepticism
... The Skeptical School of early Chinese history, started by Gu Jiegang in the 1920s, was the first group of scholars within China to seriously question the ... early Chinese history is a tale told and retold for generations, during which new elements were added to the front end" ...
Voltaire - Works - Historical
... History of Charles XII, King of Sweden (1731) The Age of Louis XIV (1751) The Age of Louis XV (1746–1752) Annals of the Empire – Charlemagne, A.D ... II (1754) Essay on the Manners of Nations (or 'Universal History') (1756) History of the Russian Empire Under Peter the Great (Vol ... II 1763) History of the Parliament of Paris (1769) ...
History of Computing
... The history of computing is longer than the history of computing hardware and modern computing technology and includes the history of methods intended for pen and paper or for chalk and slate, with or without the aid ...
Casino - History of Gambling Houses
... believed that gambling in some form or another has been seen in almost every society in history ... Greeks and Romans to Napoleon's France and Elizabethan England, much of history is filled with stories of entertainment based on games of chance ... In American history, early gambling establishments were known as saloons ...

Famous quotes containing the word history:

    Psychology keeps trying to vindicate human nature. History keeps undermining the effort.
    Mason Cooley (b. 1927)

    Indeed, the Englishman’s history of New England commences only when it ceases to be New France.
    Henry David Thoreau (1817–1862)

    The visual is sorely undervalued in modern scholarship. Art history has attained only a fraction of the conceptual sophistication of literary criticism.... Drunk with self-love, criticism has hugely overestimated the centrality of language to western culture. It has failed to see the electrifying sign language of images.
    Camille Paglia (b. 1947)