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Why tomorrow is predicted to be a tiny bit shorter than a typical day

By Nell Greenfieldboyce

Published July 21, 2025 at 4:16 PM EDT

The days have been shorter than normal, at least if you count your time in milliseconds.

Nell Greenfieldboyce

Nell Greenfieldboyce is a NPR science correspondent.

Stories From This Author

100 years after evolution went on trial, the Scopes case still reverberates

Nell Greenfieldboyce

One hundred years ago, the small town of Dayton, Tenn., became the unlikely stage for one of the most sensational trials in American history, over the teaching of Darwin's theory of evolution.
NASA spots a new comet flying in from a distant star system

Nell Greenfieldboyce

The newly discovered interstellar visitor is just the third of its kind and fascinates astronomers who hope to learn from it about galaxies far, far away.
A new observatory in Chile releases some of its first images

Nell Greenfieldboyce

The powerful Vera C. Rubin Observatory is releasing some of its first images as part of an ambitious effort to effectively create a movie of all the changes in the southern night sky over a decade.