Final answer:
The Apollo 8 astronauts orbited the Moon in 1968, but additional information such as the mass of the Moon and the velocity of the spacecraft is needed to calculate the orbital period.
Step-by-step explanation:
In 1968, Frank Borman, Jim Lovell, and Bill Anders became the first humans to orbit the Moon aboard Apollo 8. The question pertains to calculating the orbital period of their spacecraft, which had an orbit ranging from 59.7 miles to 60.7 miles above the lunar surface.
To find the orbital period, one would use orbital mechanics and Newton's law of universal gravitation, in conjunction with the average altitude of the orbit and the mass of the Moon. However, the given information is not sufficient to calculate the orbital period directly as it lacks specific mass and velocity data.