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When the measurement was standardised in 1800ish. There were two systems. One was the length of a pendulum with a half-period of one second, can't remember the other. The current (pretty accurate) system of measurement is the length traveled by light in vacuum during 1/299, 2972, 458 of a second.

Quote from: paul.fr on 26/07/2007 15:15:19When the measurement was standardised in 1800ish. There were two systems. One was the length of a pendulum with a half-period of one second, can't remember the other. The current (pretty accurate) system of measurement is the length traveled by light in vacuum during 1/299, 2972, 458 of a second. But again, these sound arbitrary. Why 1/2,992,972,458 of a second, and not 1/3,000,000,000? We could still use fractions of this smaller measure?

Quote from: dentstudent on 26/07/2007 15:19:23Quote from: paul.fr on 26/07/2007 15:15:19When the measurement was standardised in 1800ish. There were two systems. One was the length of a pendulum with a half-period of one second, can't remember the other. The current (pretty accurate) system of measurement is the length traveled by light in vacuum during 1/299, 2972, 458 of a second. But again, these sound arbitrary. Why 1/2,992,972,458 of a second, and not 1/3,000,000,000? We could still use fractions of this smaller measure?It would be very interesting to know how our world would be if that was light's speed. []The actual value is 299,792,458 m/s.