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autumn equinox

noun
- 1. the equinox in autumn, on about 22 September in the northern hemisphere and 20 March in the southern hemisphere.
- ▪ the equinox in September, when the sun crosses the celestial equator in a southerly direction.
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Autumnal Equinox
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Astronomical event
Two moments in the year when the Sun is exactly above the Equator and day and night are of equal length; also, either of the two points in the sky where the ecliptic (the Sun’s annual pathway) and the celestial equator intersect. britannica.com
- Northern Hemisphere: September equinox
- Northern Date: September 21 – 24
- Southern Hemisphere: March equinox
- Southern Date: March 19 – 21
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Image source: britannica.com