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Home Q & A Board Science-Related Homework Help Physics Astronomy
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barry barry
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10 years ago
How did Galileo's observations of Venus disprove the Ptolemaic model?
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10 years ago
Ptolemy said that the epicycles for both Venus and Mercury were centered on the Earth-Sun line, so they must always lie between us and the Sun, so would always appear as crescents in the telescope.  Galileo found Venus went through the entire phase cycle, proving that she revolved completely around the Sun, as predicted by Copernicus in his heliocentric model.
Would you know my name, if I saw you in heaven?

Eric Clapton
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barry Authorbarry
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10 years ago
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