A new atomic clock at the National Institute of Standards and Technology in Boulder is helping researchers count seconds to ensure the world is on time.

From space, the Atomic Clock Ensemble in Space will link to some of the most accurate clocks on Earth to create a ...

The European Space Agency’s ACES mission could ultimately pave the way for a global network of atomic clocks that make these ...

Thanks to a speed-up of Earth's rotation, the length of the astronomical day and the length of the clock day aren't quite ...