How was the Heliocentric theory proved?

While not the only discovery that led to the acceptance of a Heliocentric Universe, Galileo's observation of the phases of Venus in the early 17th century was a major contributor. With the advances he made with his telescope he effectively refuted the Ptolemaic system which was widely accepted during his time. Copernicus was responsible for most of the theory, but it wasn't proven until long after his death.

I have a hub about how Galileo responded to some of the criticism he received for reporting his findings that might be of interest: hubpages.com/hub/Galileo-Defends-Heliocentr.

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