Space rendezvous is a precise orbital maneuver, which requires two spacecrafts to arrive at the same orbit, and move at the same speed. Since the orbital velocity is usually not less than 7 km/s, a 1-second error will case a distance of 7 kilometers between the spacecrafts. Such an error is unacceptable, as rendezvous is a prerequisite of docking, which requires spacecrafts to rendezvous as close as some dozen meters. Initially, astronauts were not aware of principles of the space mechanics. Engineer André Meyer says that “to catch something on the ground, one simply moves as quickly as possible ...
Essays on Thrusting
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