The word “equinox” comes from Latin aequus, meaning “equal,” and nox, “night.” On the equinox, day and night are roughly equal in length. The autumnal equinox-also called the September or fall equinox-is the astronomical start of the fall season in the Northern Hemisphere and of the spring season in the Southern Hemisphere. Autumnal Equinox Dates YearĪutumn days come quickly, like the running of a hound on the moor. EDT in the Northern Hemisphere. The equinox occurs at the same moment worldwide. The fall equinox arrives on Wednesday, September 22, 2021, at 3:20 P.M. –Philip Larkin, British poet (1922 –86) When Is the Autumnal Equinox?
