Italian astronomer and mathematician who was the first to use a telescope to study the stars
Polish astronomer who produced a workable model of the solar system with the sun in the center (1473-1543)
Greek philosopher. A pupil of Plato, the tutor of Alexander the Great, and the author of works on logic, metaphysics, ethics, natural sciences, politics, and poetics, he profoundly influenced Western thought. In his philosophical system, which led him to criticize what he saw as Plato's metaphysical excesses, theory follows empirical observation and logic, based on the syllogism, is the essential method of rational inquiry.
Compiled the first detailed observational data on planetary motion (mars), without a telescope.