precession.h   precession.h 
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#define _PRECESSION_H_ #define _PRECESSION_H_
#ifdef __cplusplus #ifdef __cplusplus
extern "C" { extern "C" {
#endif #endif
//! Precession modelled from: //! Precession modelled from:
//! J. Vondrák, N. Capitaine, and P. Wallace: New precession expressions, v alid for long time intervals //! J. Vondrák, N. Capitaine, and P. Wallace: New precession expressions, v alid for long time intervals
//! A&A (Astronomy&Astrophysics) 534, A22 (2011) //! A&A (Astronomy&Astrophysics) 534, A22 (2011)
//! DOI: http://dx.doi.org/10.1051/0004-6361/201117274 //! DOI: http://dx.doi.org/10.1051/0004-6361/201117274
//! with correction from
//! J. Vondrak, N. Capitaine, P. Wallace
//! New precession expressions, valid for long time intervals (Corrigendum)
//! A&A 541, C1 (2012)
//! DOI: http://dx.doi.org/10.1051/0004-6361/201117274e
//!
//! This paper describes a precession model valid for +/-200.000 years from J2000.0 and consistent with P03 precession accepted as IAU2006 Precession. //! This paper describes a precession model valid for +/-200.000 years from J2000.0 and consistent with P03 precession accepted as IAU2006 Precession.
//! Some better understanding of the angles can be found in: //! Some better understanding of the angles can be found in:
//! + 1994AJ____108__711W J.G.Williams: Contributions to the Earth's Obliqu ity Rate, Precession and Nutation (Angles of eq. (35)) //! + 1994AJ____108__711W J.G.Williams: Contributions to the Earth's Obliqu ity Rate, Precession and Nutation (Angles of eq. (35))
//! + A&A 459, 981–985 (2006) DOI: 10.1051/0004-6361:20065897: Wallace&Capi taine: Precession-nutation procedures consistent with IAU 2006 resolutions //! + A&A 459, 981–985 (2006) DOI: 10.1051/0004-6361:20065897: Wallace&Capi taine: Precession-nutation procedures consistent with IAU 2006 resolutions
//! //!
//! The angles computed therein are used to rotate the planet Earth's axis, and also to rotate an "Ecliptic of Date", i.e. the current orbital plane o f Earth. //! The angles computed therein are used to rotate the planet Earth's axis, and also to rotate an "Ecliptic of Date", i.e. the current orbital plane o f Earth.
//! Currently this is without Nutation. //! Currently this is without Nutation.
//! Return values are in radians //! Return values are in radians
void getPrecessionAnglesVondrak(const double jde, double *epsilon_A, double *chi_A, double *omega_A, double *psi_A); void getPrecessionAnglesVondrak(const double jde, double *epsilon_A, double *chi_A, double *omega_A, double *psi_A);
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