Thanks to a speed-up of Earth's rotation, the length of the astronomical day and the length of the clock day aren't quite ...

Time is what we want most, but use worst,” William Penn once wrote. But for the first time in the annals of modern times, the very fabric of timekeeping is being threatened by no human weakness, but ...

The story begins in 1835, when the first of what would become thousands of dams was built. These human-made reservoirs store ...

Earth is spinning faster this summer, making the days marginally shorter and attracting the attention of scientists and timekeepers.July 10 was the shortest day<a class="excerpt-read-more" href=" More ...

Until 2020, the shortest day ever recorded was -1.05 ms, which means the Earth completed its rotation in 1.05 milliseconds ...

Earth doesn't rotate exactly on schedule. Scientists believe that today is going to be about a millisecond short of a typical ...

Did you feel it? The planet spun a bit faster last week, by enough to give us our shortest day of the year, so far.

July 22 will be the second-shortest day of the year, as Earth completes a full rotation in less time than usual.

Tuesday, July 22 will be the second-shortest day of the year, as Earth completes a full rotation in less time than usual. The ...

A tiny shift in Earth’s spin could trigger a move timekeepers have never made before, and it might impact everything from ...