Autumn Equinox 2024 Meaning In English. Most people on earth will experience around 12 hours of day and 12 hours of night during september’s. Autumnal equinox marks the end of summer and the beginning of fall.

While meteorologists like to call fall at the beginning of september, astronomical autumn starts later, on the autumnal equinox. As the summer days wane and the crispness of fall settles in, the autumn equinox emerges as a pivotal moment in the annual calendar.