the great circle on the celestial sphere intersecting the celestial equator at about 23° and representing the changing position of the sun with respect to the background stars, as seen from the orbiting earth during one year
the plane of the earth's orbit extended infinitely
adjective
of eclipses or the ecliptic
See ecliptic in American Heritage Dictionary 4
(ĭ-klĭpˈtĭk)
noun
The intersection plane of the earth's orbit with the celestial sphere, along which the sun appears to move as viewed from the earth.
A great circle inscribed on a terrestrial globe inclined at an approximate angle of 23°27: to the equator and representing the apparent motion of the sun in relation to the earth during a year.