The Old Farmer’s Almanac says that the autumnal equinox arrives tomorrow, Tuesday, September 22 at 9:31 AM:
The word “equinox” comes from Latin aequus, meaning “equal,” and nox, “night.” On the equinox, day and night are roughly equal in length. (See more about this below.)
During the equinox, the Sun crosses what we call the “celestial equator”—an imaginary extension of Earth’s equator line into space. The equinox occurs precisely when the Sun’s center passes through this line. When the Sun crosses the equator from north to south, this marks the autumnal equinox; when it crosses from south to north, this marks the vernal equinox.
Scott took this photo on the final day of the summer of 2016 at the St. Joseph Lighthouse. See more in his massive Lighthouses gallery on Flickr.