Equinox comes from two latin words 'aequus' meaning EQUAL and 'nox' meaning NIGHT. It is used to describe either of the two days a year when length of day and night are equal. Equinoxes occur twice a year, once in March and once in September.
September or Autumnal Equinox is the time of the year when the sun crosses the immaginary celestial line that divides the earth into two equal parts, i.e the equator. Compared to Solstice, equinoxes happens faster and the effects are not noticeable. On this day, every place on Earth has nearly 12 hours of daylight.
On average, Autumnal Solstice occurs on September 22 or 23 every year, but can happen a day earlier or later, depending on when the sun makes it's way past the Earth's equatorial plane. On this day, fall or Autumn begins in places north of the equator except the polar regions (i.e Arctic and Antarctic) where it marks the beginning of winter there, and places south of the equator it is spring time in places south of the equator.
For the northern tropical and subtropical regions, temperatures begin to cool off from the summer heat, trees shed their leaf and you change from wearing a plain shirt to a light jacket. Places south begins to heat up after the long dead winter and flowers starts to bloom and all creatures come out of hibernation, more fun outdoor activities and picnics. You change from thick sweater to a light knicker.
Something happens after equinoxes, for Autumnal Equinox, few days after the equinox, there'll be a day where the the length of day and night is equal, it's called equilux, meaning equal light. It happens somewhere around September 26. This shouldn't be confused with equinox. For further understanding of the two terms: equinox and equilux. You can go online and get more information about these astronomical terms.
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