Super Science Friends: how to save Newton

There is a new animated series in the city⁽¹⁾: Super Science Friends. Created by Brett Jubinville of Tinman Creative Studios, it was funded the first short through Kickstarter, while the rest of the episodes can be supported on Patreon.
The series is evidently inspired by Super Friends, produced by Hanna-Barbera for DC Comics, with the place of the heroes of JLA taken by some iconic scientists: Marie Curie, with a radioactive ring similar to Green Lantern’s one; Charles Darwin, able to transform into any animal, like Beast Boy from the Teen Titans; Nikola Tesla, with electromagnetic powers, like Magneto from Marvel universe, historical X-Men enemy; Sigmund Freud, father of psychoanalysis with oversight of lust, to be seen as an alternative to Aquaman with his oversight of aquatic creatures.

De mundi systemate

by @ulaulaman about #IsaacNewton #physics #gravity

I published this post some years ago (archived version), but for unilateral decision of the online publisher, it is deleted, so I decide to recover it.

It's the third pard o Newton's Philosophiae Naturalis Principia Mathematica, one of the most famous physics tractatus (latin world to treatise). In 2010 Dave Richeson proposes An amazing paragraph from Euler's Introductio, a wonderful post in which he extraxts some Euler's quotes from Introductio in analysin infinitorum (Introduction to analysis of the infinite). So, because I'm working on a learning project about gravity, I decide to propose an analouge post about De mundi systemate (On worlds' system). For english version of the following Newton's quotes I'll ask help to Andrew Motte.
We began with Propositio II (Proposition II):