To one of the two fundamental planes, the ecliptic is closer to the unmoving background stars. The ecliptic poles are perpendicular to the ecliptic, where the North ecliptic pole is the pole of the North equator.
The ecliptic forms as one of the fundamental planes that are used as a reference for the positions these planes are the celestial sphere and the celestial equator. It is important to reference the plane and acts as a basis for the ecliptic coordinate system. From the observer’s perspective who is on the Earth, the movement of the sun around the celestial sphere with a period of one year can trace the path along the ecliptic that has a background of stars against it. The plane of the Earth’s orbit around the sun is known as the ecliptic.
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