The new clock is so reliable that it would be off by less than a second if it had started running 100 million years ago, ...

The National Institute of Standards and Technology's new cesium fountain clock is one of the most precise atomic clocks ever ...

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 ...

We normally think of atomic clocks ... state of a stationary cesium-133 atom at a temperature of 0K. But there is a move to replace that definition using optical clocks that are 100 times more ...

Cesium fountain clocks such as NIST-F4 are a type of atomic clock—a complex, high-precision device that extracts timing pulses from atoms. These clocks play a critical role in our globally ...

The invention – called the optical lattice clock – is a thousand times more accurate than cesium atomic clocks used for international timekeeping and is a contender for redefining how long a ...

Whether you find yourself glancing at a clock on the wall or checking your phone, the time you constantly see is the product of a meticulous system upheld by the world’s timekeepers. In the U.S., a ...