precession.h   precession.h 
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//! Return values are in radians. //! Return values are in radians.
//! This solution is currently unused, it seems easier to use the Capitaine sequence above. //! This solution is currently unused, it seems easier to use the Capitaine sequence above.
void getPrecessionAnglesVondrakPQXYe(const double jde, double *vP_A, double *vQ_A, double *vX_A, double *vY_A, double *vepsilon_A); void getPrecessionAnglesVondrakPQXYe(const double jde, double *vP_A, double *vQ_A, double *vX_A, double *vY_A, double *vepsilon_A);
//! Return ecliptic obliquity. [radians] //! Return ecliptic obliquity. [radians]
double getPrecessionAngleVondrakEpsilon(const double jde); double getPrecessionAngleVondrakEpsilon(const double jde);
//! Just return (previously computed) ecliptic obliquity. [radians] //! Just return (previously computed) ecliptic obliquity. [radians]
double getPrecessionAngleVondrakCurrentEpsilonA(void); double getPrecessionAngleVondrakCurrentEpsilonA(void);
// To complete the task of correct&accurate precession-nutation handling, f ind fitting IAU-2000A Nutation and how this fits in here. // To complete the task of correct&accurate precession-nutation handling, w e need fitting IAU-2000A or IAU-2000B Nutation.
// E.g. A&A 459, 981–985 (2006) P. T. Wallace and N. Capitaine: Precession- nutation procedures consistent with IAU 2006 resolutions. DOI: 10.1051/0004 -6361:20065897 // E.g. A&A 459, 981–985 (2006) P. T. Wallace and N. Capitaine: Precession- nutation procedures consistent with IAU 2006 resolutions. DOI: 10.1051/0004 -6361:20065897
// Oh well, IAU 2000A nutation has 1400 terms and goes into micro-arcsecond s. All we ever aim for is sub-arcsecond, if at all, this is more than cover ed by IAU-2000B. // IAU 2000A nutation has 1400 terms and goes into micro-arcseconds. All we ever aim for is sub-arcsecond, if at all, this is more than covered by IAU -2000B.
//! Compute and return nutation angles of the abridged IAU-2000B nutation. //! Compute and return nutation angles of the abridged IAU-2000B nutation.
//! @param JDE Julian day (TT) //! @param JDE Julian day (TT)
//! @return deltaPsi, radians //! @return deltaPsi, radians
//! @return deltaEps, radians //! @return deltaEps, radians
//! Ref: Dennis D. McCarthy and Brian J. Lizum: An Abridged Model of the Pr ecession-Nutation of the Celestial Pole. //! Ref: Dennis D. McCarthy and Brian J. Lizum: An Abridged Model of the Pr ecession-Nutation of the Celestial Pole.
//! Celestial Mechanics and Dynamical Astronomy 85: 37-49, 2003. //! Celestial Mechanics and Dynamical Astronomy 85: 37-49, 2003.
//! This model provides accuracy better than 1 milli-arcsecond in the time 1995-2050. //! This model provides accuracy better than 1 milli-arcsecond in the time 1995-2050.
//! TODO: find out drift rate behaviour e.g. in 17./18. century, maybe use nutation only e.g. 1610-2200? //! TODO: find out drift rate behaviour e.g. in 17./18. century, maybe use nutation only e.g. 1610-2200?
void getNutationAngles(const double JDE, double *deltaPsi, double *deltaEps ilon); void getNutationAngles(const double JDE, double *deltaPsi, double *deltaEps ilon);
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