 Space rendezvous, a space rendezvous is an orbital maneuver during which to spacecraft, one of which is often a space station, arrive at the same orbit and approach to a very close distance e.g. within visual contact. Rendezvous requires a precise match of the orbital velocities and position vectors of the two spacecraft, allowing them to remain at a constant distance through orbital station keeping. Rendezvous may or may not be followed by docking or berthing, procedures which bring the spacecraft into physical contact and create a link between them. The same rendezvous technique can be used for spacecraft landing on natural objects with a weak gravitational field, e.g. landing on one of the Martian moons would require the same matching of orbital velocities, followed by a descent that shares some similarities with docking.