Word: evenson
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Dates: during 1970-1979
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...scientists working under Dr. Kenneth M. Evenson at the National Bureau of Standards in Boulder, Colo., have measured c with new accuracy. Working with a laser beam-pure light of a single frequency-they have refined the measurement of light's speed to 186,282.3960 miles per second. In effect they reduced the accepted speed by roughly 144 feet per second. This may not seem important to camera fans worrying about exposure, or yachtsmen timing a flashing light on a dark night. But it could make a considerable difference to scientists calculating the precise landing site of an astronaut...