Autumnal equinox occur on which date?

21 March 23 September 21 June 22 December

23 September

Solstices are the longest and shortest days of the year, while equinoxes occur when the day and night are equally as long.An equinox occurs at the start of the spring and fall. The solstice occurs during the summer and the winter. Occurs on March 21 (Vernal equinox) and on September 23 (Autumnal equinox). Occurs on June 21(Summer Solstice) and on Dec 22 (Winter Solstice).