What is an atomic clock and how does it work?

The best way would be for everyone to have one of those atomic clocks.

A new type of atomic clock has the potential to do far better, to be accurate to within a second every few billion years.

An atomic clock is accurate to within 1 second in 1.7 million years.

My atomic clock would be a form of cheating to him.

That, too, can be measured by the use of atomic clocks.

In 1994, the atomic clock was replaced with a newer model.

Atomic clocks can tell us when to add leap seconds to the year to keep Earth in step with true time.

Such is the atomic clock of New York night life.

Then, they sent a portable atomic clock between the facilities to check.