The autumnal equinox

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The word equinox means "equal night"; night and day are about the same length of time.
The September equinox occurs the moment the Sun crosses the celestial equator – the imaginary line in the sky above the Earth’s Equator – from north to south. This happens either on September 22, 23, or 24 every year.
In 2015, the autumnal equinox falls on September 23 at 4:21 A.M. (ET).
Wed Sep 23 2015 September equinox Season
Thu Sep 22 2016 September equinox Season
Fri Sep 22 2017 September equinox Season
Sun Sep 23 2018 September equinox Season
Mon Sep 23 2019 September equinox Season
Tue Sep 22 2020 September equinox Season

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