Autumnal Equinox

The Autumnal Equinox occurs around September 22-23 in the Northern Hemisphere, marking the moment when the Sun crosses the celestial equator heading south. It results in nearly equal daylight and night hours—roughly 12 hours each—signaling the beginning of fall. This happens because Earth's tilt and orbit position cause the Sun to be directly over the Earth's equator. It’s a key point in the year’s solar cycle, balancing daylight across the globe, and occurs twice annually—once in September and once in March as the Sun crosses the equator again during the equinoxes.