What Galileo Got Wrong

• Defended Copernicus’ inaccurate, Platonic system: circular orbits, uniform motion, cycles and epicycles.

• Refused to answer Kepler’s letters about his findings; he either never read Kepler’s work, couldn't understand it, or chose to ignore it.

• Added no new observations to establish the motion of the earth around the sun.

• Made his case for heliocentrism based on the motion of the tides (rejected then and now as false; Kepler conjectured that the moon caused the tides).