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Since 1967, the second has been defined to be the duration of

9,192,631,770 periods of the radiation corresponding to the

transition between the two hyperfinelevels of the ground state

of the cesium 133 atom at rest at a temperature of Zero Kelvin.

Before 1967, it had been defined in terms of a fraction of the mean

solar day, and later of the Earth's orbital period.

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