> For the complete documentation index, see [llms.txt](https://aerospace.jamiepegg.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://aerospace.jamiepegg.com/aerospace-fundamentals.md).

# Aerospace Fundamentals

- [Apsides](https://aerospace.jamiepegg.com/aerospace-fundamentals/apsides.md)
- [Horizontal Coordinate System](https://aerospace.jamiepegg.com/aerospace-fundamentals/horizontal-coordinate-system.md)
- [Keplerian (Orbital) Elements](https://aerospace.jamiepegg.com/aerospace-fundamentals/keplerian-orbital-elements.md)
- [Obit Types](https://aerospace.jamiepegg.com/aerospace-fundamentals/obit-types.md)
- [Geostationary (GEO)](https://aerospace.jamiepegg.com/aerospace-fundamentals/obit-types/geostationary-geo.md)
- [Low Earth (LEO)](https://aerospace.jamiepegg.com/aerospace-fundamentals/obit-types/low-earth-leo.md)
- [Sun-Synchronous (SSO)](https://aerospace.jamiepegg.com/aerospace-fundamentals/obit-types/sun-synchronous-sso.md)