Final answer:
Katherine Johnson's contributions to the U.S. Space Program include calculating the trajectory for the first moon landing.
Step-by-step explanation:
Katherine Johnson made significant contributions to the U.S. Space Program with her mathematical calculations and expertise in orbital mechanics. One of her most notable achievements was calculating the trajectory for the first moon landing. Her work was crucial in determining the timing and path of the spacecraft. Johnson's contributions were recognized in the book and film, Hidden Figures, which highlighted the important role of African American women in the early years of the space program.