September 23 is the 266th day of the year 2019. There are 99 days remaining until the end of the year and is frequently the convergence of two stellar events: the birth of Saint John Coltrane and the autumnal equinox the "equinox" spans several days before AND after that date.

The Fall Equinox is also known as Alban Elfed, Autumn Equinox, Autumnal Equinox, Cornucopia, Feast of Avilon, Festival of Dionysus, Harvest Home, Harvest Tide, Mabon, Night of the Hunter, Second Harvest Festival, Wine Harvest, Witch's Thanksgiving, and the first day of autumn. Many religious festivals occur on or near the equinox, for example, In 2019, Rosh Hashanah begins at sundown on Sunday, Sept. 29 and ends at sundown on Tuesday, Oct. 1. Michaelmas (also known as the Feast of Michael and All Angels), on September 29, falls near the September equinox.