The ecliptic is the great circle representing the path in which the sun appears to move in the celestial sphere.
"Lectures in Navigation"
Ernest Gallaudet Draper
The point from which this celestial longitude begins is not at Greenwich, but the point where the celestial equator intersects the ecliptic in the spring of the year, i.
"Lectures in Navigation"
Ernest Gallaudet Draper
This line is called the ecliptic.
"A Text-Book of Astronomy"
George C. Comstock