/*
 * kepler.h -- Two-body Keplerian position from classical elements
 *
 * Exposes kepler_position() for use by orbital_elements_type.c
 * and any future code that needs raw Keplerian propagation.
 */

#ifndef PG_ORRERY_KEPLER_H
#define PG_ORRERY_KEPLER_H

/*
 * Two-body Keplerian position from classical orbital elements.
 *
 * q (AU), e, inc/omega/Omega (radians), T_peri (JD), jd (JD).
 * Output: pos[3] in AU, ecliptic J2000 frame.
 *
 * Handles elliptic (e<0.99), near-parabolic (0.99<=e<=1.01),
 * and hyperbolic (e>1.01) orbits.
 */
extern void kepler_position(double q, double e, double inc,
                            double omega, double Omega,
                            double T_peri, double jd, double pos[3]);

#endif /* PG_ORRERY_KEPLER_H */