Wiktionary
n. autumnal equinox
Usage examples of "autumn equinox".
The eight points correspond with the mid-winter solstice in the North, Imbolc in the North-east, the spring equinox in the East, Beltain in the South-east, the summer solstice in the South, Lughnassadh in the South-west, the autumn equinox in the West, and Samhain in the North-west.
At each point, naturally, the sun is seen to rise in a different constellation (thus if the sun rises in Pisces at the spring equinox, as it does at present, it must rise in Virgo at the autumn equinox, in Gemini at the winter solstice and in Sagittarius at the summer solstice).
One time just at the autumn equinox a scouting party shot arrows at us, but both palisades were finished by then, so they left when they saw they could do no damage with such small numbers.
By the position of the Dipping Cup, swinging low in the north, and the trail of the Serpent along the southwestern horizon, she knew that the autumn equinox would have fallen just before the last new moon.