The equinoxes is the intersection of the celestial Ecuador with the ecliptic. The intersection of this line with the celestial sphere are the equinoctial points. Vernal or Aries point, to the point where the Sun is projected to going from South to North is called and is one of two intersections with the celestial sphere of the Equinox line. Under the precession of the equinoxes is line retrograde 50.25 " / year turning a clockwise in 25800 years.
