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

An equinox is a twice-yearly event in March and September when the Sun is directly above the equator, causing nearly equal day and night across the globe. This year's autumn equinox will take place ...

The autumn equinox marks the end of summer and the beginning of fall in the Northern Hemisphere. In 2025, the first day of fall will be Monday, Sept. 22. During the equinox, the sun crosses directly ...