n. 25B6; noun
the earth's orbit around the sun : COURSE, path, circuit, track, trajectory, rotation, revolution, circle.
the problem comes outside our orbit : SPHERE (OF INFLUENCE), area of activity, range, scope, ambit, compass, jurisdiction, authority, remit, domain, realm, province, territory; informal bailiwick.
25B6; verb Mercury orbits the sun : REVOLVE ROUND, circle round, go round, travel round.