Speed of Light
In 1878, Newcomb had started planning for a new and precise measurement of the speed of light that was needed to account for exact values of many astronomical constants. He had already started developing a refinement of the method of Léon Foucault when he received a letter from the young naval officer and physicist Albert Abraham Michelson who was also planning such a measurement. Thus began a long collaboration and friendship. In 1880, Michelson assisted at Newcomb's initial measurement with instruments located at Fort Myer and the United States Naval Observatory, then situated on the Potomac River. However, Michelson had left to start his own project by the time of the second set of measurements between the observatory and the Washington Monument. Though Michelson published his first measurement in 1880, Newcomb's measurement was substantially different. In 1883, Michelson revised his measurement to a value closer to Newcomb's.
Other articles related to "speed of light, light":
... The speed of light is (by definition) exactly 299,792,458 m/s, very close to 300,000 km/s ... This is a pure coincidence ...
... started planning for a new and precise measurement of the speed of light that was needed to account for exact values of many astronomical constants ...
... relative to the aether, the hypothetical medium in which light was supposed to travel, resulted in a null result ...
... increasing the accuracy of measurements of the speed of light, first by cavity resonance techniques and later by laser interferometer techniques ... spectral line of krypton-86, a group at NBS in Boulder, Colorado determined the speed of light in vacuum to be c = 299,792,456.2±1.1 m/s ... using the value 299,792,458 m/s for the speed of light ...
Famous quotes containing the words speed of, light and/or speed:
“No speed of wind or water rushing by
But you have speed far greater.”
—Robert Frost (18741963)
“O take fast hold; let that light be thy guide
In this small course which birth draws out to death,”
—Sir Philip Sidney (15541586)
“The correct rate of speed in innovating changes in long-standing social customs has not yet been determined by even the most expert of the experts. Personally I am beginning to think there is more danger in lagging than in speeding up cultural change to keep pace with mechanical change.”
—Mary Barnett Gilson (1877?)