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second

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

second (symbol s) The fundamental unit of time in the SI system. It is defined as the duration of 9 192 631 770 cycles of the radiation from the transition between two hyperfine levels in the ground state of caesium-133. This definition is designed to produce 86 400 s in the mean solar day.

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