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Could one use Mathematica to find a high point along the centerline that overlooks a long stretch of lower elevations to the southwest or northeast - perhaps a lake or a plain? From a high-enough location it might be possible to look down on the...
Here's a scan of the original 1610 publication: https://archive.org/details/Sidereusnuncius00Gali Jovian diagrams begin here at the bottom of the right-hand page: https://archive.org/stream/Sidereusnuncius00Gali#page/n39/mode/2up