Clocks on Earth are ticking a bit more regularly thanks to NIST-F4, a new atomic clock at the National Institute of Standards ...

Now a Japanese company has commercialized one approach—an optical-lattice clock it claims is the most accurate on the market.

A more precise definition of the second is crucial to all sorts of physical measurements – but to get there, scientists have ...

A network of Earth's best clocks will be synchronised with the most accurate one ever sent into space. But the device has a ...

The Geochron World Time Indicator is a clock that doubles as a live map of where the sun is shining on the Earth. Back in its day, it was a cult piece that some have dubbed the “Rolex on the ...

With access to a 10-MHz timebase from a cesium 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 ...