His theorys
As I mentioned earlier, Ptolemy had several theories. One of his theories was that Earth was the center of the universe. This explained to a lot of people the mysterys of the universe. Another one of his theories was his Algamest theory which mathematically explained why he believed the Earth, moon, and sun moved while the stars stood still. A lot of people also did not question whether these were correct because they figured since it was done by such an educated man, it must be correct! It was not until the early 1600's when these theories were disproved by Galileo. Although his theories were disproven, a lot of people today could still learn a thing or two from him.