Dorothy at the beginning at the book (Post office)
Dorothy at the end of the book
The line separates events. "In many ways, Dorothy Vaughan was living the American dream. The director of the Langley Research Center sent Dorothy a letter acknowledging her twenty years of service to the federal government. He presented her with a gold-and-ruby lapel pin..." Page 187.
The theme is if you put time and effort into things, good things will come out of your hard work.
"The room for the West Area computing pool was set up for about twenty workers. As members of a pool, each woman had to be ready to work on any mathematical assignment that came through the door." Page 40. "The West Computers..." Page 46. They were human computers, including Dorothy.
"Her promotion was made official when a memo circulated in January 1951: "Effective of this date, Dorothy J. Vaughan, who has been acting head of West Area Computers unit, is hereby appointed head of that unit." Page 74. "The end of West Computing was, in many ways, a long-fought-for victory... On the other hand, it meant the end of Dorothy's career as a manager... But now, she, too, was being moved to another group, with a new boss." Page 138. "Dorothy Vaughan was assigned to the newly built computer complex on Langley's west side. Page 163.
"It wouldn't be easy, but the nimble minds at Langley could make it a reality, Katherine thought. Why should flying a person to Mars be any less achievable than sending a man into orbit around Earth or landing a man on the moon? One thing built on the next. Katherine Johnson knew; once you took the first step, anything was possible." Page 198