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In the s, Mercury astronauts Alan Shepard , Gus Grissom , John Glenn and others absorbed the accolades of being the first men in space. Behind the scenes, they were supported by hundreds of unheralded NASA workers, including "human computers" who did the calculations for their orbital trajectories. The job title described someone who performed mathematical equations and calculations by hand, according to a NASA history. Human computers were not a new concept. In the late 19 th and early 20 th century, computers at Harvard University analyzed star photos to learn more about their basic properties.