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

F4, the latest cesium fountain clock that now stands as one of the most accurate timekeepers in the entire world.

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 ...

The Doomsday Clock is a symbol that represents how close we are to destroying the world with dangerous technologies of our ... and their suspicions that Germany might be able to build one. Six years ...