We normally think of atomic clocks as the gold standard in timekeeping ... levels of the ground state of a stationary cesium-133 atom at a temperature of 0K. But there is a move to replace ...

Maybe that’s even more than half of the fun. [CuriousMarc] got an HP 5061A Cesium clock, a somewhat famous instrument as the model that attempted to prove the theory of relativity. The reason?

Precision equipment manufacturer Shimadzu Corp. said it has created the world’s most accurate time device: a clock that won’t ...

atomic clocks define a second as 9,192,631,770 microwave oscillations of a cesium atom as it absorbs microwave radiation of a specific frequency. Many modern atomic clocks use oscillations of ...

In 2001, Japanese physicist Hidetoshi Katori proposed a new type of atomic clock that only loses a second every 30 billion years, a period longer than the current age of the universe. The ...