via National DayCalendar:
The Autumnal Equinox in September ushers in a change of season. It is observed annually when the sun can be seen directly overhead along the equator. The day marks the end of summer and beginning of fall in the Northern Hemisphere.
The autumn equinox is one of two days when all points on Earth except the polar regions see the sunrise and set at due east and due west. With few exceptions, all latitudes see almost precisely 12 hours of daylight and 12 of darkness.
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