Autumnal Equinox, September 2023 Autumnal Equinox Date and Timing: The Earth is divided into two hemispheres and on the day of Equinox, the sun’s rays fall equally on each hemisphere and the day and night are of equal length. There are two equinoxes in the year; one that happens in March and the other one in September. Read on to know the date, timing and significance of September Equinox. , Astrology News, Times Now