Physicists are quietly rewriting one of the most basic units in science, using a new generation of optical clocks that can keep time so precisely they barely lose a beat over the age of the universe.

Time appeared to skip a beat last week when some of the world’s most accurate clocks were affected by a wind-induced power ...

WASHINGTON — In a new study, researchers carried out the most extensive coordinated comparison of optical clocks to date by operating clocks and the links connecting them simultaneously across six ...

For decades, atomic clocks have provided the most stable means of timekeeping. They measure time by oscillating in step with ...

WASHINGTON, DC - JANUARY 28: The 2025 Doomsday Clock time is displayed after the time reveal held by The Bulletin of the Atomic Scientists at the United States Institute of Peace on January 28, 2025 ...

Atomic clocks record time using microwaves at a frequency matched to electron transitions in certain atoms. They are the basis upon which a second is defined. But there is a new kid on the block, the ...

The National Institute of Standards and Technology's new cesium fountain clock is one of the most precise atomic clocks ever created. When you purchase through links on our site, we may earn an ...

Researchers from six countries conducted the largest coordinated comparison of optical clocks to date. The measurements amount to the largest coordinated comparison of optical clocks to date, and ...

This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a ...

Major League Baseball wants to institute a 14-second pitch clock with the bases empty and a 19-second timer with runners on, according to sources familiar with the situation. The two numbers were ...

What started as a hobby became a full-blown business for Harold MacVittie more than a decade ago. His Chapin clock shop is still ticking.