September Equinox 2024 Time And Date. In different time zones, the date of the equinox may differ by a day, so it is important to indicate your exact location. It also lists astronomical sunrise and sunset timings on autumnal equinox day.
The vernal equinox marks the. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.