/usr/include/libnova/precession.h is in libnova-dev 0.16-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) 2000 - 2005 Liam Girdwood
*/
#ifndef _LN_PRECESSION_H
#define _LN_PRECESSION_H
#include <libnova/ln_types.h>
#ifdef __cplusplus
extern "C" {
#endif
/*! \defgroup precession Precession
*
* Precession is the changing direction of the Earth's rotational axis over time and
* is due to the gravitational influence of the Sun and the Moon.
*
* All angles are expressed in degrees.
*/
/*! \fn void ln_get_equ_prec(struct ln_equ_posn *mean_position, double JD, struct ln_equ_posn *position);
* \brief Calculate the effects of precession on equatorial coordinates, convert current to J2000.
* \ingroup precession
*/
/* Equ 20.2, 20.3, 20.4 pg 126 */
void LIBNOVA_EXPORT ln_get_equ_prec(struct ln_equ_posn *mean_position,
double JD, struct ln_equ_posn *position);
/*! \fn void ln_get_equ_prec2(struct ln_equ_posn *mean_position, double fromJD, double toJD, struct ln_equ_posn *position);
* \brief Calculate the effects of precession on equatorial coordinates, between arbitary Jxxxx epochs.
* \ingroup precession
*/
/* Equ 20.2, 20.3, 20.4 pg 126 */
void LIBNOVA_EXPORT ln_get_equ_prec2(struct ln_equ_posn *mean_position,
double fromJD, double toJD, struct ln_equ_posn *position);
/*! \fn void ln_get_ecl_prec(struct ln_lnlat_posn *mean_position, double JD, struct ln_lnlat_posn *position);
* \brief Calculate the effects of precession on ecliptical coordinates.
* \ingroup precession
*/
/* Equ 20.5, 20.6 pg 128 */
void LIBNOVA_EXPORT ln_get_ecl_prec(struct ln_lnlat_posn *mean_position,
double JD, struct ln_lnlat_posn *position);
#ifdef __cplusplus
};
#endif
#endif
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