The below elaborates a telescopic discovery by Galileo that indisputably debunked a falsified fact of Geocentrism that Venus revolves around the Earth.
In an era when astronomy was based on Geocentric model of Aristotelian universe, all mainstream astronomers had believed that Venus revolves around Earth like the Moon, at then the extreme crescent phase of Venus had been observed with the naked eye. Although Galileo through observations with telescope had observed that Venus exhibited a full set of phases similar to that of the Moon, he based on Copernicus's theory of heliocentrism for the qualitative prediction on the orbiting path of Venus, and after an extensive period of telescopic observation, in his validity analysis that was deliberated through inductive reasoning on Venus showed phases with a peculiarity, he proved the qualitative prediction that Venus orbits the Sun and not the Earth. See an external link on "Phases of Venus" and an animated simulation for phases of Venus.
Image above is a diagram of the orbit of Venus in relationship to the Earth.