The autumnal equinox is upon us Sunday, and with it a shift to shorter days, longer nights and the astronomical start of fall in the Northern Hemisphere. Equinoxes occur when Earth reaches a point in ...

The Fall Equinox marks the official start of autumn in the Northern Hemisphere, representing a key shift in Earth’s relationship with the Sun. While it is often linked to equal day and night, the ...

In the Northern Hemisphere, the equinox symbolizes the onset of shorter days with longer, cooler nights, while in the Southern Hemisphere, spring arrives with longer, warmer days. This year, the ...

Stars and planets are lining up for the change of seasons during the Northern Hemisphere's autumnal equinox this year.

The autumnal equinox doesn't just mark a seasonal shift, but also increases the chances of dazzling auroras thanks to the Earth's orientation and magnetic field The National Oceanic and Atmospheric ...

The equinox arrives on Saturday, marking the start of the fall season for the Northern Hemisphere. But what does that actually mean? Here's what to know about how we split up the year using the ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. A sky-covering aurora as seen from the Hurtigruten ship the ...

As the Earth travels around the sun, it does so at an angle. For most of the year, the Earth’s axis is tilted either toward or away from the sun. That means the sun’s warmth and light fall unequally ...

Spring is almost here — officially, at least. The vernal equinox arrives on Tuesday, marking the start of the spring season for the Northern Hemisphere. But what does that actually mean? Here's what ...