Before revision: The first point of Aries, also known as the cusp of Aries, is the location of the vernal equinox (March equinox ), used as a reference point in celestial coordinate systems.
After revision: The first point of Aries, also known as the cusp of Aries, is the location of the March equinox (the vernal equinox in the northern hemisphere, and the autumnal equinox in the southern ), used as a reference point in celestial coordinate systems.