Autumnal equinox explained: Fall begins with the arrival of the autumnal equinox

The video explains how Earth's 23.5-degree tilt affects the seasons, with the northern hemisphere tilting away from the sun in winter and towards it in summer. It also covers the concept of equinoxes, where day and night are equal, occurring twice a year. The vernal equinox marks spring, and the autumnal equinox marks fall. The autumnal equinox typically occurs around September 22nd to 24th, with a specific example from 2015.

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