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    Re: Two years after Galileo: an English telescope in Japan
    From: Fred Hebard
    Date: 2020 Dec 28, 16:02 -0500
    Starting to dredge up some memories. I recall that Galileo’s observations of Jupiter’s moons, which clearly revolved around it, constituted the evidence that convinced him that the Ptolomaic model was incorrect.  The problem was tying that piece of evidence into a rigorous  proof.

    Fred Hebard

    On Dec 28, 2020, at 14:45, David Fleming <NoReply_Fleming@fer3.com> wrote:

    I find it hard to believe that there was possibly a proof of heliocentrism available to Galileo.  If someone can recall such a proof please post.

    Absent any understanding of Newton's ideas governing the motions of bodies one could always suppose that deus ex machina causes the observations to be due to a stationary earth and moving celestial bodies.


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