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   GhostOnTheHalfShell (ghostonthehalfshell@masto.ai)'s status on Wednesday, 15-Jan-2025 00:51:02 JST GhostOnTheHalfShell

   in reply to

   • John Overholt

   @overholt

   I am given to understand that Copernicus used epicycles just as the geocentric model had before it because it was only after Kepler where elliptical paths were considered.

   For those of you with the math background, you would recognize epicycles as version of a Fourier transform. Epicycle model was quite successful predicting the location of planets in the night sky. Which offers a good lesson that the predictive models do not have to be casual.

   • Embed this notice
     John Overholt (overholt@glammr.us)'s status on Wednesday, 15-Jan-2025 00:51:03 JST John Overholt

     Newly digitized: one of our two copies of Copernicus's De Revolutionibus (1543) and this simple but groundbreaking diagram of a solar system in which Earth orbits the Sun. https://nrs.lib.harvard.edu/urn-3:fhcl.hough:105279774

     Bill repeated this.