Dating back to Ancient Greece, we’ve known Earth’s rotation takes about 24 hours to complete. Since then, we’ve updated our ...

At the International Earth Rotation and Reference Systems Service in Paris, a quiet calculation takes place several times a year. Technicians compare the world’s atomic clocks, which measure time with ...

As if it's not already hard enough to find the time to do everything you need to do in a day, now you're about to lose another whole millisecond or more. In fact, experts say Tuesday, July 22, could ...

We’ve probably all had a few conversations with people who hold eccentric scientific ideas, and most of the time they yield nothing more than frustration and perhaps a headache. In [Bertrand Selva]’s ...

Aren’t the summer days supposed to be longer and the winter days shorter? Since when have things gone in reverse for the summertime? Since now, maybe? Starting today? Okay, here’s what’s going on.

If you’re the kind of person who gets a lot done, you’re grateful for every one of the 86,400 seconds that make up a day. On July 9, however, as well as on July 22, and August 5, you won’t get your ...

Japanese researchers investigated ancient texts from the 4th to 7th centuries CE to identify five total solar eclipses near the Eastern Mediterranean and improve the model of the Earth's rotation over ...

For most of human history, our ancestors kept time by the sun—the interval between one sunrise and the next marked the passage of what we call a day. But then, in the 1950s, scientists invented atomic ...

On those three days, just over a millisecond is expected to be shaved off the standard 24-hour day. Of course, you're unlikely to notice such a miniscule difference in your day. But scientists who ...

Climate change is causing the ice masses in Greenland and Antarctica to melt. Water from the polar regions is flowing into the world’s oceans –and especially into the equatorial region. “This means ...