The source code is available on GitHub under the MIT license.
Abstract
This mod aims to replace KSP's unstable physics integration with a higher-order symplectic integrator, adding n-body Newtonian gravitation in the process.
Acronyms
Documentation and download
Principia is not built in the same way as most other mods (most of it is native code, with a thin C# interface layer), so that compatibility issues may arise depending on the platform.
Binaries are availabl