Orbital Elements and Kepler Propagation - Physics Library Original software in this resource is licensed under the GNU General Public License, version 3 or (at your option) any later version. The full license is included as COPYING in the offline project archive. Original mathematical explanations and reference data are licensed under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0). https://creativecommons.org/licenses/by-sa/4.0/ Bundled Three.js and astronomia use the MIT license. Lucide uses the ISC license. Their complete notices are included in THIRD-PARTY.txt. The visual design was inspired by https://ki-math.github.io/orbital-elements-viewer/; no source code, models, textures or images were copied from that project. Physics Library names and branding are not granted by these software licenses. There is no warranty. Presets are illustrative, not live ephemerides.