“As an engineer of many years standing, I saw that this absurd allowance is only permitted in school books. No engineer would dream of allowing anything of the kind." - W. Winckler, 1893.
Athanasius Kircher - Diagrams of the different World Systems: Ptolemaic, Platonic, Egyptian, Copernican, Tychonic and semi-Tychonic, “Iter Exstaticum”, 1671.