Module physics 

Proper-time rates and quadratic clock polynomials.

Types

• Position – Cartesian position (meters)
• Velocity – Cartesian velocity (m/s)
• Spacetime – lapse α and spatial-velocity fraction β for one clock
• Drift – quadratic clock polynomial

Import: use deep_time::physics::{Drift, Position, Spacetime, Velocity}.

The instantaneous rate is Spacetime::proper_time_rate_offset. The offset over a span is Drift::time_diff_after. Apply a polynomial to an epoch with Dt::convert_using_drift or Dt::adjusted_advance. Theory: docs/relativity.md.

Filling Spacetime

Every constructor uses the same interval. Spacetime::new stores α and β you already have (from a metric, or computed yourself). The others fill those two numbers from potential and velocity. Then Drift::from_spacetime if you need the quadratic.

You have	Constructor
α and β already in hand	Spacetime::new
Lapse α and spatial velocity (m/s)	Spacetime::from_lapse_and_velocity
Φ in m²/s² (negative for bound gravity) and velocity	Spacetime::from_potential_and_velocity
IERS / geodesy positive (U) (m²/s²) and velocity	Spacetime::from_positive_potential_and_velocity
Dimensionless Φ/c² and velocity	Spacetime::from_potential_over_c2_and_velocity

Re-exports

pub use drift::Drift;

pub use position::Position;

pub use spacetime::Spacetime;

pub use velocity::Velocity;

Modules

drift

Clock polynomial for the difference between proper time and a coordinate time.

position

3D position vector (in meters) for physics inputs.

spacetime

Lapse, spatial velocity, and proper-time rate for one clock.

velocity

Velocity vector in meters per second.