Fall Equinox 2025 Date And Time

Fall Equinox 2025 Date And Time. The period from one such day to another is called the tropical (solar) year. Autumn 2025 starts on monday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth's axis.

The equinox is the time or date (twice each year) at which the sun crosses the celestial equator and when day and night are of equal length. The table presented here gives the date and time (greenwich mean time).