An atomic clock is known to be the most accurate measurement ... See real-time clock and atom. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

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

The European Space Agency (ESA) has launched ACES, or the Atomic Clock Ensemble in Space ... scientific community and will surely play a key role in pushing towards the re-definition of the standard ...

We normally think of atomic clocks as the gold standard in timekeeping. The very definition of a second — in modern times, at least — is 9,192,631,770 periods of the radiation corresponding to ...