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Think You Know What a Second Is? It Will Likely Change in the Next Decade.
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Lengthy article from NIST on a potential change in the fundamental definition of a second from the current cesium-133 atomic clocks to an "optical clock." Target is to work out and approve the details by around 2030, so not much is certain yet. It won't change the nominal length of a second, but, like other recent changes, improve the precision of realization.
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