On a campus in Boulder, Colorado, time just became a little more exact. Inside the National Institute of Standards and ...

The result is a clock with a total a total systematic uncertainty of 2.2×10⁻¹⁶ — a precision that means it loses less than a second every 140 million years. This extremely subtle lag is ...

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

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 ...

According to scientists at NIST in Boulder, their newest atomic clock, the NIST-F4, will help track time more precisely and ...

Atomic clocks record time using microwaves at a frequency matched to electron transitions in certain atoms. They are the basis upon which a second is defined. But there is a new kid on the block ...

Scientists have developed one of the most precise atomic clocks ever built, and they plan to use it as a reference clock to define time itself. Based on the rising and falling of cesium atoms ...