Heliocentrism, a central theory of the sixteenth-century Scientific Revolution, was first promoted by

While Galileo Galilei significantly advanced the heliocentric theory through his observations using a telescope, such as the moons of Jupiter and the phases of Venus, he did not originate the concept. His work provided crucial evidence that supported Copernican heliocentrism but came after Copernicus had already proposed the theory.

Andreas Vesalius is primarily known for his contributions to human anatomy and the field of medicine, particularly through his influential book "De humani corporis fabrica." He did not focus on astronomy or the heliocentric model and is unrelated to the development of astronomical theories.

René Descartes was a philosopher and mathematician who contributed to many fields, including philosophy and optics, but he did not promote heliocentrism. His work focused more on rationalism and the scientific method rather than the structure of the solar system.

Ptolemy was an ancient astronomer and mathematician known for his geocentric model of the universe, which placed the Earth at the center. His theories were dominant before Copernicus but directly conflict with the heliocentric view.