What'S The First Day Of Fall 2025. The autumnal equinox is an astronomical event that marks the start of autumn. That's the day of the autumnal equinox when day and night are nearly equal in length.
The first day of autumn often called fall (september equinox or autumnal equinox) is when the sun shines directly on the celestial equator passing from north to south and the length of day and night are almost the same. That’s the day of the autumnal equinox when day and night are nearly equal in length.
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