The Celestial Equator and the Ecliptic are two Great Circles on the Celestial Sphere, set at an angle of 23.5 degrees. The two points where they intersect are called the Equinoxes. The Vernal Equinox has coordinates RA=0.0 hours, Dec=0.0 degrees. The Autumnal Equinox has coordinates RA=12.0 hours, Dec=0.0 degrees.
O Ecuador celeste e a Eclíptica son dous círculos máximos da esfera celeste situados a un ángulo de 23, 5 graos. Os dous puntos onde se interseccionan chámanse equinocios. O Equinocio Vernal ten as coordenadas AR=0, 0 horas, Dec=0, 0 graos. O Equinocio de Outono ten as coordenadas AR=12, 0 horas, Dec=0, 0 graos.