The targeting cards contained detailed instructions for launching the missile. The most important variables were elevation, azimuth, range, length of time the rocket was under power, type of explosion, and size of the nuclear charge. The cards were the product of weeks of painstaking geodesic research and complicated mathematical calculations. In contrast to a cruise missile, which is powered throughout its flight, a ballistic missile is only powered for the first few minutes after takeoff. It then follows a trajectory that can be calculated with varying degrees of accuracy. Mechanical
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