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How was the length of a meter redined in 1983?

Updated: 8/18/2019
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13y ago

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The metre was originally defined as one ten-millionth of the distance from the North Pole to the equator a;ong the meridian going through Paris. As the measurement of the earth improved, the metre had to be recalibrated. That is not much use for something that is meant to be a standard, So in 1983 it was redefined as the distance travelled by light, in vacuum, in 1/299792458 second.

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Q: How was the length of a meter redined in 1983?
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