Autumn Equinox 2021 – 23 September
September 25 , 2021
1318 days
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- The Autumn Equinox can occur any time between September 21 and September 24.
- This year, it occurred on September 23.
- Equinox is an astronomical event caused by Earth's tilt on its axis as it revolves around the Sun.
- On this day, Earth's axis is tilted 23.5 degrees from the plane of its orbit.

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