Before revision: Free return trajectory A free-return trajectory is a symmetrical orbit past the moon and Earth that was 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.
After revision: Free return trajectory A free-return trajectory is a symmetrical orbit past the Moon and Earth that was 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.