Crate keplerian 

Domain-agnostic Keplerian dynamics on typed quantities.

Scientific scope

This crate provides reusable two-body astrodynamics primitives: anomaly solving, Keplerian elements, Lambert transfers, and transfer invariants.

Technical scope

Public APIs depend only on qtty and affn; no time-scale or astronomy orchestration types are introduced here.

References

• Battin, R. H. (1999). An Introduction to the Mathematics and Methods of Astrodynamics.
• Vallado, D. A. (2013). Fundamentals of Astrodynamics and Applications.

keplerian

Domain-agnostic Keplerian dynamics in Rust: typed anomaly solvers, classical elements, two-body propagation, Lambert transfers, and transfer/search helpers built only on qtty and affn.

Scope

This crate owns reusable central-force / two-body dynamics that do not require astronomy-specific semantics.

In scope:

• elliptic, parabolic, and hyperbolic anomaly conversions and Kepler solves,
• typed Keplerian elements and typed Cartesian states,
• analytic two-body propagation under a fixed gravitational parameter,
• Lambert boundary-value solvers,
• transfer invariants and caller-driven Lambert search grids.

Out of scope:

• epochs, time scales, and calendars,
• ephemerides, bodies, observatories, or frame pipelines,
• non-Keplerian perturbation models.

Crate boundary

qtty   ─── typed quantities and units
affn   ─── typed geometry, frames, centers
   │
   └──> keplerian

Features

Feature	Default	Effect
std	yes	Standard-library support via qtty.
alloc	no	Enables Vec-backed search grids.
serde	no	Serde derives for public data types.

License

AGPL-3.0-only.

Re-exports

pub use eccentricity::Eccentricity;

pub use error::KeplerError;

Modules

anomaly

Typed anomaly newtypes, solvers, and anomaly conversions.

eccentricity

Domain-semantic eccentricity scalar and conic regime classifier.

elements

Typed Keplerian orbital elements and Cartesian conversions.

error

Top-level error aggregation for crate workflows.

lambert

Typed Lambert boundary-value solving.

prelude

Convenience re-exports of the most commonly used public items.

problem

Typed central-force two-body propagation context.

state

Typed Cartesian two-body state vectors.

transfer

Analytic transfer and invariant helpers for two-body motion.