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Speed of light in historical perspective

c. Speed of light in historical perspective. Harry H. Mark, MD, FACS. The Question: Is the speed of light constant ?. “Law of Inertia” = “Galilean System of Coordinates” = “Principle of Relativity”. Nicole Oresme (c. 1320 – 1382).

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Speed of light in historical perspective

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  1. c Speed of light in historical perspective Harry H. Mark, MD, FACS

  2. The Question: Is the speed of light constant ?

  3. “Law of Inertia” =“Galilean System of Coordinates” =“Principle of Relativity”

  4. Nicole Oresme (c. 1320 – 1382) “Inside the boat moved rapidly eastward there can be all kind of movements – horizontal, criss-cross, upward, downward, in all directions – and they seem exactly the same as those when the ship is at rest.”

  5. Ole Roemer (1644 – 1710) “…forty revolutions observed at the side F might be sensibly shorter than forty others observed in any place of the Zodiack where Jupiter may be met with.” Philos. Transact. Roy. Soc. London, 1677 * * * “At a constant distance from the observer the revolutions of the sails appear just as quick as it actually is. If, however, the observer moves very quickly away, the revolution must appear slower, because the light from each successive position reaches him later. The period of revolution apparently depends upon the relative velocitywith regards to the observer’ Ernst Mach

  6. James Bradley (1693 – 1762) . The fact of aberration means that the speed of light (c’) referred to a moving earth (√ c2 + v2 ;or c/cosα) is greater than the speed of light referred to a stationary earth.

  7. Albert A. Michelson (1852 – 1931)

  8. Alfred Potier 1840 -- 1905 George F. FitzGerald 1851 -- 1901 Hendrik A. Lorentz 1853 -- 1928

  9. The Question: Is the speed of light constant ? The evidential Answer: NO!

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