The description of the word you requested from the astronomical dictionary is given
the ecliptic ⇒
The ecliptic is
- the plane of the Earth's orbit.
- the line where the plane of the Earth's orbit intersects the
celestial sphere. This is almost the same as the path that the Sun
appears to take between the stars, as seen from the Earth.
The ecliptic passes through the middle of the zodiac. All of the
planets and the Moon also stay close to the ecliptic.