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    Re: Two years after Galileo: an English telescope in Japan
    From: Fred Hebard
    Date: 2020 Dec 28, 15:52 -0500
    The two systems were equivalent mathematically.  I would think a straightforward frame of reference change.  The problem was how to show a preference for one frame over the other.  The blog I mentioned goes into that.  Sorry for the lack of a citation

    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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