The Ancient Greeks focused on observing the solar system.. They thought that Earth was a sphere and was still.
Thought The Earth was inside a rotating dome
Capernicus predicted the mothion of planets. He still thought that the other planets moved but the Earth stayed still.
Discovered 4 moons around jupiter
Believed Moon and Sun revolved around the Earth
Made detailed observations
Kepler had three laws The path of the planets about the sun is elliptical in shape,with the center of the sun being located at one focus. (The Law of Ellipses) An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time. (The Law of Equal Areas) The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. (The Law of Harmonies)
Any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Law of Universal Gravitation