The model he made he had the sun the moon, planets and stars move around the earth because he thought that if the earth revolved around the sun the stars would be in a different place every night also known a a parallax
He was a mathmitishon and a geographer who wrote the book Almagest witch was one of the first books to be written he believed that the planets revolved around the earth in circles and the outside was a sphere of stars
He thought that ptolemys model was to complicated but used some stuff from it. He was the first to have the sun in the center and was and is seen by a lot of people as the first to modern models