the ninth configuration

scene from the film written and directed by the exorcist's william peter blatty

"ever try to shoot a slow-flying duck while standing rigidly on a fast rotating platform, and with a gun that uses bullets which curve 90° while in flight?" 
The trajectory design model shown above allowed Mariner mission planners during mission development in 1967 to illustrate the orientation of the planet and calculate the the expected path of the Mariner 6 and 7 spacecraft, as well as the window of opportunity for the instruments and television cameras to operate during the flyby.