While much of the U.S. sees its hottest day in late July, some coastal cities like San Francisco don’t peak until fall. A ...

Is the Earth spinning faster? Is July 22 the shortest day ever? Here's what to know about the Earth's rotation and why is today the shortest day.

Scientists break down the reasons why days are getting shorter—and the mystery they're still trying to solve about Earth's ...

Our galaxy will make for a particularly splendid sight on the dark nights surrounding the new moon phase on July 24.

Two days this summer have been unusually short, with the shortest expected on Aug. 5, leading global timekeepers to consider ...