Aequinox, That time of the yeere, when the daius and nights be of equall length; which hapneth twice in the yeere, to wit, in March and September.
1603, Plutarch, “[An Explanation of Sundry Hard Words and Obscure Terms, in this Translation of Plutarch, [….] Aequinox]”, in Philemon Holland, transl., The Philosophie, Commonlie Called, The Morals […], London: […] Arnold Hatfield, page 635