America's official time is kept at a government laboratory in Boulder, Colo., and according to the clock at the entrance, I was seven minutes behind schedule.

Faith Kipyegon's time during the historic Breaking4 attempt on June 26 was controversially revised downwards by more than ...

It's unclear why the mistake was made. The stoppage, which by our estimation lasted 2.7 seconds, gave the Saints time to line up and spike the clock.

An optical atomic clock measures the energy transitions of strontium atoms rather than the caesium atoms used in the clocks that are the world’s official time-keepers. Credit: K. Palubicki/NIST ...

A new atomic clock is one of the world’s best timekeepers, researchers say — and after years of development, the “fountain”-style clock is now in use helping keep official U.S. time. Known ...

The United Arab Emirates Official Time is regarded as an advanced model for time measurement. The caesium clock’s frequency is based on the invariant properties of the caesium atom, making it a highly ...

Custodian Ray Keen inspects a clock face before changing the time on the 100-year-old clock atop the Clay County Courthouse Saturday, March 8, 2014, in Clay Center, Kansas. Charlie Riedel / AP ...

The UAE Official Time is regarded as an advanced model for time measurement. The caesium clock's frequency is based on the invariant properties of the caesium atom, making it a highly accurate ...

Like it or not, it’s time to fall back again. Most of the United States and Canada is about to switch to standard time, moving clocks back an hour Sunday morning. The official time change will ...

The good thing about this new clock is that it is an upscaled version of Tag Heuer Formula 1 Ref. 371.508 diver. The model dates back to the early ’90s, when Tag Heuer was crowned the official ...

The 1972 debut of the leap second meant that any time the two clocks grew apart by more than 0.9 seconds, we’d get a leap second—basically pausing the atomic clock to let the astronomical one ...

America's official time is kept at a government laboratory in Boulder, Colo., and according to the clock at the entrance, I was seven minutes behind schedule. I rush across the campus of the ...