Now a Japanese company has commercialized one approach—an optical-lattice clock it claims is the most accurate on the market.

A network of Earth's best clocks will be synchronised with the most accurate one ever sent into space. But the device has a ...

The Geochron World Time Indicator is a clock that doubles as a live map of where the sun is shining on the Earth. Back in its day, it was a cult piece that some have dubbed the “Rolex on the ...