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The first proposal for the meter was the described pendulum in about 1668. But the French Academy of Science decided to choose the form of the earth as a base in 1791. The meter was the one ten-millionth part of the longitudinal length North-Pole to Equator through Paris. They built prototype meter bars that were used as definition. Sometime the realization set in that aging might change the prototype meter and duplicating might be faulty. So a definition was looked for which described the length of the prototype meter bar with firm physical characteristics, in the end the speed of light. But it is still the same length. [quote user="RME"]The fact that the 'time' involved does not fit into the groups-of-three SI framework applied to time in seconds, and would hence be deprecated, is a mere intellectual bagatelle[/quote] Could you please elabotate? I understand that there are currently seven basic SI dimensions that can not be deviated by multiplication of other SI-dimensions: meter, kilogram, second, ampere, kelvin, mole, candela. Regards, Volker
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