Today's sea level rise is significant enough to slow the rotation of the planet by just over a millisecond per century.

Find out what’s speeding up Earth’s rotation and why it may force timekeepers to delete a second ...

Once a year, at a single precise instant, our tilted, spinning planet reaches a state of geometric equilibrium, and the whole ...

Look out for the moon's upturned crescent, now just 2%-lit, above the evening star of Venus, as light reflected from Earth's ...

The spring equinox marks the first day of spring today, but daylight actually lasts several minutes longer than night. Here's ...

Sky This Week is brought to you in part by Celestron. Friday, March 20The vernal equinox occurs at 10:46 A.M. EDT, bringing ...

New observations are helping scientists peer beneath the Sun’s surface, revealing where its magnetic activity may truly begin. Every 11 years, the Sun’s magnetic field reverses. As that cycle unfolds, ...