Resembling a squat, wide fridge, the world's most accurate clock went on sale for $3.3 million in Japan on Wednesday. The "Aether clock OC 020" is so precise that it would take 10 billion years for it ...

Learn about NIST-F4, the latest cesium fountain clock that now stands as one of the most accurate timekeepers in the entire world. The universal need to be on time keeps everyone on the move, shaping ...

Clocks began as simple timekeepers, but some became landmarks through the use of sundials and now have reached the majestic stage set by the architecture of clocks. In addition to serving as mere ...

Custodian Ray Keen inspects a clock face. A new study says world clocks will need a "negative leap second" to stay accurate. (Charlie Riedel/AP) ...

To measure time, you need a constant rhythm. For eons, the regular movements of the sun and moon have set the pace for all of life on Earth. But over millennia, humans have sought and found more ...

Earth’s changing spin is threatening to toy with our sense of time, clocks and computerized society in an unprecedented way — but only for a second. For the first time in history, world timekeepers ...

The infamous twin paradox sends the astronaut Alice on a blazing-fast space voyage. When she returns to reunite with her twin, Bob, she finds that he has aged much faster than she has. It’s a ...