Not surprisingly, Western China is the deepest red. All of China’s clocks are set to Beijing time, meaning that solar noon happens at about 3 p.m. in the far-western Xinjiang province.

NIST-F4 is a cesium fountain clock, which is considered the cream of the crop — there are fewer than 20 of its kind operating in the entire world. Fountain clocks are not constantly running like ...

The best clocks now lose only a second every 300 million years – and those tiny time-keeping differences are changing our world. David Robson reports.

According to scientists at NIST in Boulder, their newest atomic clock, the NIST-F4, will help track time more precisely and help put global time on a more accurate frequency.

The apocalyptic clock was first used in 1947 and has been used ever since to examine the likelihood of a man-made catastrophe - and it says humanity is still at great risk ...