As U.S. clocks shift forward this weekend, many earthlings will find themselves momentarily confused about what time it is. But scientists say a far larger temporal problem is looming on the horizon: ...

The U.S. government calculates the country's official time using more than a dozen atomic clocks at a federal facility northwest of Denver. But when a destructive windstorm knocked out power to the ...

Astronauts, set your watches. Time on the surface of the moon has been calculated to tick at a rate of 57 millionths of a second a day faster than it does on Earth, a difference that could be crucial ...

Time zones are important. They make it easy to know that when it's 3 p.m. in New York, it's noon in Los Angeles. But what time is it on the moon? Back in April, the Biden-Harris administration asked ...

Cesium beam clocks (left) and hydrogen masers are among the types of atomic clocks used by the National Institute of Standards and Technology (NIST) to determine official U.S. time. (J. Sherman, R.