The clock hands are set by the Bulletin of the Atomic Scientists, a group formed by Manhattan Project scientists at the University of Chicago who helped build the atomic bomb but protested using it ...

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Even your Macbook or smartphone displays time which is synchronized to the NIST-F1 clock, a cesium fountain atomic clock (aka ... the clock winds up and runs for about an hour.

In 2001, Japanese physicist Hidetoshi Katori proposed a new type of atomic clock that only loses ... showing in 2020 that clocks set on the observation deck at 450 metres ticked faster by 4/ ...

That big grandfather clock ... fountain atomic clock — no less a clock than the one that’s used to define the SI second, by the way — [Daniel] looked for ways to sync the clock up to it.

However, atomic clocks are now reaching unprecedented precision, bringing these elusive effects within measurable range. "Since these clocks simultaneously interrogate many atoms, they provide a ...