Before revision: A Cycler is a spacecraft on a closed transfer orbit that passes close to two celestial bodies at regular intervals Free-return trajectory a symmetrical orbit past the moon and Earth first analysed by Arthur Schwaniger Lunar cycler , a spacecraft trajectory that encounters the Earth and the Moon on a regular basis, or a spacecraft on such a trajectory , using gravity assists and occasional propellant-powered corrections to maintain its trajectories between the two.
After revision: A Cycler is a spacecraft on a closed transfer orbit that passes close to two celestial bodies at regular intervals Free-return trajectory a symmetrical orbit past the moon and Earth first analysed by Arthur Schwaniger Lunar cycler A lunar cycler or Earth–Moon cycler is a cycler orbit, or spacecraft therein, which periodically passes close by the Earth and the Moon , using gravity assists and occasional propellant-powered corrections to maintain its trajectories between the two.