It should be noted that Brahe's model was not the classical Ptolemaic geocentric / epicyclic model: "It is conceptually a geocentric model: the Earth is at the

It should be noted that Brahe's model was not the classical Ptolemaic geocentric / epicyclic model: "It is conceptually a geocentric model: the Earth is at the center of the universe, the Sun and Moon and the stars revolve around the Earth, and the other five planets revolve around the Sun." [1] The Popperian model of science suggests that it steps from one empirically-sound but falsifiable position to another, but that is the view with hindsight - what happens at the leading edge is much more fluid, and having the right sort of instincts about where the evidence is leading is not just a matter of luck. Heliocentricity was generally accepted well before stellar parallax was observed. It appears to me that MOND (Modified Newtonian Dynamics) seems to be going the way of Brahe's model - it fitted the initial data, but does not seem to work consistently for the general case. [1] https://en.wikipedia.org/wiki/Tychonic_system https://en.wikipedia.org/wiki/Tychonic_system