America's official time is kept at a government laboratory in Boulder, Colo., and according to the clock at the entrance, I was seven minutes behind schedule.

He is America's official timekeeper at the ... an atomic clock that uses oscillations in the element cesium to count out 0.0000000000000001 second at a time. If the clock had been ...

In such demonstrations, optical clocks are not generating or keeping official time -- rather, they provide extremely stable (intermittent) frequency references that support time generation.

A new atomic clock is one of the world’s best timekeepers, researchers say — and after years of development, the “fountain”-style clock is now in use helping keep official U.S. time. Known ...

Many other countries have their own official time broadcasts, based on other atomic clocks. A clock that stays accurate for 100 million years is pretty good, right? Not for NIST.

The United Arab Emirates Official Time is regarded as an advanced model for time measurement. The caesium clock’s frequency is based on the invariant properties of the caesium atom, making it a highly ...