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precession.h
1 /*
2 * This library is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU Lesser General Public
4 * License as published by the Free Software Foundation; either
5 * version 2 of the License, or (at your option) any later version.
6 *
7 * This library is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10 * Lesser General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
15 *
16 * Copyright (C) 2000 - 2005 Liam Girdwood
17 */
18
19 #ifndef _LN_PRECESSION_H
20 #define _LN_PRECESSION_H
21
22 #include <libnova/ln_types.h>
23
24 #ifdef __cplusplus
25 extern "C" {
26 #endif
27
41 /* Equ 20.2, 20.3, 20.4 pg 126 */
42 void LIBNOVA_EXPORT ln_get_equ_prec (struct ln_equ_posn * mean_position, double JD, struct ln_equ_posn * position);
43
49 /* Equ 20.2, 20.3, 20.4 pg 126 */
50 void LIBNOVA_EXPORT ln_get_equ_prec2 (struct ln_equ_posn * mean_position, double fromJD, double toJD, struct ln_equ_posn * position);
51
56 /* Equ 20.5, 20.6 pg 128 */
57 void LIBNOVA_EXPORT ln_get_ecl_prec (struct ln_lnlat_posn * mean_position, double JD, struct ln_lnlat_posn * position);
58
59 #ifdef __cplusplus
60 };
61 #endif
62
63 #endif
ln_get_equ_prec
void LIBNOVA_EXPORT ln_get_equ_prec(struct ln_equ_posn *mean_position, double JD, struct ln_equ_posn *position)
Calculate the effects of precession on equatorial coordinates, convert current to J2000...
Definition: precession.c:64
ln_get_equ_prec2
void LIBNOVA_EXPORT ln_get_equ_prec2(struct ln_equ_posn *mean_position, double fromJD, double toJD, struct ln_equ_posn *position)
Calculate the effects of precession on equatorial coordinates, between arbitary Jxxxx epochs...
Definition: precession.c:119
ln_equ_posn
Equatorial Coordinates.
Definition: ln_types.h:170
ln_lnlat_posn
Ecliptical (or celestial) Longitude and Latitude.
Definition: ln_types.h:200
ln_get_ecl_prec
void LIBNOVA_EXPORT ln_get_ecl_prec(struct ln_lnlat_posn *mean_position, double JD, struct ln_lnlat_posn *position)
Calculate the effects of precession on ecliptical coordinates.
Definition: precession.c:177