History of astronomy and the Phases of Venus

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Does anyone know when it was first realised that a heliocentric model of the cosmos should show the phases of Venus in the way Galileo saw them in the 17th century.?Was it known in the time of Aristarchus or did people only realise this was a consequence of helicoentrism later on, perhaps only in the 17th century Ad or ....?
Many thanks
 

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  • #2
phyzguy
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I could be wrong, but I don't think anyone thought about it until Galileo pointed his telescope at the skies and discovered the phases of Venus. Before then the planets were just points of light. How could a point source show phases? It was Galileo that first realized that the phases of Venus were a powerful argument in favor of the heliocentric model.
 
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  • #3
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I could be wrong, but I don't think anyone thought about it until Galileo pointed his telescope at the skies and discovered the phases of Venus. Before then the planets were just points of light. How could a point source show phases? It was Galileo that first realized that the phases of Venus were a powerful argument in favor of the heliocentric model.
Didn't Nicholas of Cusa (who was alive about 200 years before Galileo saw Venus through his telescope ) think of planets as bodies with living beings on them?
 
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  • #4
phyzguy
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Didn't Nicholas of Cusa (who was alive about 200 years before Galileo saw Venus through his telescope ) think of planets as bodies with living beings on them?
Maybe. If so, I'd like to see the documentation. Why would you single out the planets from the stars? They look the same except that the planets move.
 
  • #5
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Well he also thought the universe was infinite, I'm not sure there was observational evidence for that either but people like to speculate. As for documentation, I have read many sources that refer to his views but I cant claim to have read his original texts. But here is an example of a brief biography, there are many others : https://www.catholicscientists.org/catholic-scientists-of-the-past/nicholas-of-cusa

Source https://www.physicsforums.com/threads/history-of-astronomy-and-the-phases-of-venus.1009674/
 

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