Time dilation, a captivating concept embedded in Einstein’s theory of relativity, has been experimentally validated on Earth.

Thanks to Einstein's theory of relativity, numerous tests have concluded tangible effects on how we on Earth record and measure the passing of time.

BRAUNSCHWEIG, Germany — Time measurement is entering a new era. The next generation of atomic clocks uses laser light instead of microwaves to track time, oscillating about 100,000 times faster ...

Countries step up research into sophisticated clocks as wars and accidents expose vulnerabilities in crucial timing systems ...

The way time is measured is on the edge of a historic upgrade. At the heart of this change is a new kind of atomic clock that uses light instead of microwaves. This shift means timekeeping could ...

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 ...

NIST scientists have published results establishing a new atomic clock, NIST-F4, as one of the world’s most accurate timekeepers, priming the clock to be recognized as a primary frequency ...

Atomic clocks rely on the steady frequency at which electrons in atoms transition between energy levels. Keeping a count of these oscillations allows atomic clocks to measure time with extremely ...

Atomic clocks use quantum physics and the resonant frequency of atoms, like cesium, to define time with incredible precision.

They’re determined by fundamental constants. And that’s why atomic clocks are the best way of keeping time right now.” But cesium clocks are no longer the most accurate clocks available.

A radio-controlled clock has a radio inside, which receives a signal that comes from a place where an atomic clock is located, so they are always accurate, according to the National Institute of ...