equinoctial circle(n = noun.location) celestial equator, equinoctial, equinoctial line - the great circle on the celestial sphere midway between the celestial poles;
is a kind of great circle

antarctic circle, arctic circle, back circle, charmed circle, circle, circle around, circle of curvature, circle of willis, circle round, color circle, dip circle, double leg circle, dress circle, equinoctial, equinoctial line, equinoctial point, equinoctial storm, equinoctial year, fairy circle, family circle, full circle, grand circle, great circle, hour circle, in a circle, inner circle, osculating circle, parhelic circle, parquet circle, polar circle, traffic circle, vertical circle, vicious circle, winner's circle