The Vernal Equinox is that one which the sun passes through or intersects in going from S to N declination, and the autumnal Equinox that which it passes through or intersects in going from N to S declination.
"Lectures in Navigation"
Ernest Gallaudet Draper
Our way then again turned to the north over a hill which rises at the foot of the Ifinger, whose snowy summit towered in the clear autumnal sky.
"The Dead Lake and Other Tales"
Paul Heyse
Up there the scanty warmth, and light of the autumnal sun could not penetrate, and the dim cool twilight which prevailed, inclined them to silence.
"The Dead Lake and Other Tales"
Paul Heyse