Note 57 — CHAP. XIV. Of the Precession of the Equinoxes.
Reading edition
The Equinoctial Circle intersects the Ecliptic in two opposite points, called Aries and Libra, from the Signs which always keep in these points: They are called the Equinoctial Points, because when the Sun is in either of them, he is directly over the terrestrial Equator; and then the days and nights are equal.