1. (Science: astronomy) a great circle of the celestial sphere, making an angle with the equinoctial of about 23 deg 28'. It is the apparent path of the sun, or the real path of the earth as seen from the sun.
(Science: astronomy) lunar ecliptic limit, the space of 12 deg on the moons orbit from the node, within which, if the moon happens to be at full, it will be eclipsed. Solar ecliptic limit, the space of 17 deg from the lunar node, within which, if a conjunction of the sun and moon occur, the sun will be eclipsed.