The axis of the ecliptic is called the line perpendicular to the plane of the Ecliptic. Its intersection with the celestial sphere is called poles of the north and south ecliptic respectively. As the plane of the ecliptic is relatively immobile, its pole is also immobile. The pole of the equator revolves around the ecliptic pole at an angle of 23 ° 26 '(see Ecliptic Obliquity) by virtue of precession of the equinoxes over a period of 25800 years. This angle is the same that form the celestial equator and the ecliptic.
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