The official first day of fall, otherwise known as the autumnal equinox, is this weekend in the Northern Hemisphere.

In the Northern Hemisphere, the autumn equinox falls on September the 22nd or 23rd of September, marking the point where day and night are about the same length before the days begin to get ...

The Northern Hemisphere’s spring — or vernal — equinox can land between March 19 and 21, depending on the year. Its fall – or autumnal — equinox can land between Sept. 21 and 24.

This story was updated to add new information. Farewell, flip-flops. And hello pumpkin spice. Our long, hot summer finally ...

The vernal equinox marks the changing of seasons. For the Northern Hemisphere, winter recedes into spring. In the Southern Hemisphere, it's reversed. Countries such as Australia, New Zealand and ...

Spring - brought on by the March equinox - is only a few weeks away. You can also count down the days to spring in real time.

At this time of year, it can sometimes feels like the cold and dreary winter weather will be neverending. To cheer yourself up, you might be wondering when sunnier days are on the horizon.