One of the two coordinates in the ecliptic system; the angle measured eastwards along the ecliptic from 0° to 360°, with the origin at the vernal equinox.
The plane of Earth's orbit around the Sun. The ecliptic plane is used as the main reference when describing the position of other objects that rotate about the Sun or need to be located with respect t
o the Sun and the Earth. The angle between the ecliptic plane and the plane of an orbit is called the inclination.
Either of the two points on the celestial sphere that are 90° above and below the plane of ecliptic. The north ecliptic pole lies in Draco, and the south ecliptic pole in Dorado. Due to precession, th
e celestial pole moves in a circle around the ecliptic poles once every 25,800 years.