23/09/2026
The Autumn Equinox
The Autumn Equinox is an astronomical event that marks the transition from summer to autumn in the Northern Hemisphere. It occurs when the Sun crosses the celestial equator from north to south, causing the Sun’s rays to fall almost directly over the equator.
This phenomenon occurs due to the 23.5° tilt of Earth’s axis and its revolution around the Sun. During the equinox, neither the Northern nor the Southern Hemisphere is tilted significantly toward the Sun. As a result, day and night are nearly equal in length across the world.
In the Northern Hemisphere, the Autumn Equinox generally occurs around 22–23 September and marks the beginning of astronomical autumn. It is one of the two equinoxes that occur each year, the other being the Spring Equinox.
The Autumn Equinox is therefore not simply a change in weather or season; it is a consequence of Earth’s position and axial orientation as it travels around the Sun.
