//! Coordinate frames and transforms.
//!
//! Three reference frames are modeled as a `Category` from comp-cat-rs:
//!
//! - **ECI** (Earth-Centered Inertial): the TEME frame used by SGP4
//! - **ECEF** (Earth-Centered Earth-Fixed): rotates with the Earth
//! - **Geodetic**: latitude, longitude, altitude above the WGS-84 ellipsoid
//!
//! Morphisms between frames are coordinate transforms parameterized by
//! GMST angle.  Composition fuses transforms algebraically.

pub mod category;
pub mod ecef;
pub mod eci;
pub mod geodetic;
pub mod vec3;
