Autumnal Equinox Calendar Add to Calendar Add to Timely Calendar Add to Google Add to Outlook Add to Apple Calendar Add to other calendar Export to XML When: September 22, 2017 all-day2017-09-22T00:00:00-05:002017-09-23T00:00:00-05:00On the equinox, night and day are almost exactly the same length, about 12 hours all over the world. This is the reason it’s called an “equinox,” derived from Latin, meaning “equal night.
