In a moving base simulator, such as a simulator in which a spacecraft cabin is suspended on hydraulically moved pylons to enable it to tilt, physical motion must take place. For example, when an astronaut fires thrusters, the simulator must activate readouts and lights showing the thrusters firing, fuel reducing, velocity changes, and also show movement in the scene outside the cabin window. Requirements for realism increase the complexity of the simulation. Simulators must provide the astronaut trainee with as close an approximation of spaceflight as is possible on earth, without losing sight of the need to extensively practice procedures to respond to failures as well as nominal events. Lunar landing crews used simulators more than half the time 1.
Each crewman in the Mercury, Gemini, and Apollo programs spent one third or more of his total training time in simulators. Feeling obligated to prepare the astronauts for every possible contingency, NASA required hundreds of training hours in high fidelity simulators. Chapter Nine - Making New Reality: Computers in Simulations and Image Processing - Crew-training simulators NASA's requirements for flight simulators far exceeded the state of the art when the first astronaut crews reported for duty in 1959. Computers in Spaceflight: The NASAExperience
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