orbit, celestial orbit -- (the (usually elliptical) path described by one celestial body in its revolution about another; "he plotted the orbit of the moon")
sphere, domain, area, orbit, field, arena -- (a particular environment or walk of life; "his social sphere is limited"; "it was a closed area of employment"; "he's out of my orbit")
scope, range, reach, orbit, compass, ambit -- (an area in which something acts or operates or has power or control: "the range of a supersonic jet"; "a piano has a greater range than the human voice"; "the ambit of municipal legislation"; "within the compass of this article"; "within the scope of an investigation"; "outside the reach of the law"; "in the political orbit of a world power")
orbit, electron orbit -- (the path of an electron around the nucleus of an atom)