The middle-range shifts that unfold over several decades have been harder to explain.

Scientists may have solved why the length of Earth’s day changes by a few milliseconds over decades. Subtle shifts in the ...

For practical purposes, we say that one day—the time it takes for Earth to rotate once on its axis—equates to 24 hours. In ...

Scientists have discovered a hidden force deep inside Earth that is changing the length of our days.

The question “What would happen if Earth stopped rotating” may sound like pure science fiction, but it is a powerful thought experiment that helps explain how our planet truly works. Earth Earth is ...

Earth's days are not exactly the same length. Scientists have been recording small variations in for decades. These changes are minuscule—sometimes just a few milliseconds—and mostly imperceptible, ...

Tiny changes in Earth’s rotation may reveal a tug-of-war between its deformable inner core, liquid outer core and deep mantle.

When Earth tips over to restore its rotational balance, sea levels shift around the globe—episodes scientists have now traced ...

A battle of forces, driven by the motion of Earth’s core, can explain small variations in the planet’s rotation, study finds.

Although the Earth completes one full rotation in 86,400 seconds on average, that spin fluctuates by a millisecond or two every day. Before 2020, the Earth never experienced a day shorter than the ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...