Is the fall equinox actually the day that day and night are precisely equal? It’s a question that recurs each September, and although the name implies they’re equal, they happen to work out slightly ...

The fall equinox marks the first day of autumn. When does fall officially begin in 2025? This visual guide will help get you oriented.

Fall officially starts in just a few days. Here is everything to know about the last day of summer, what an equinox is and why it's so important.

As the earth spins on its axis, producing night and day, it also moves about the sun in an elliptical (elongated circle) orbit that requires about 365 1/4 days to complete. The earth's spin axis is ...