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core/planetsephems/l1.h

00001 /************************************************************************
00002 
00003 The L1 theory of the galilean satellites
00004 by Valery Lainey can be found at
00005 ftp://ftp.imcce.fr/pub/ephem/satel/galilean/L1
00006 
00007 I (Johannes Gajdosik) have just taken the Fortran code and data
00008 obtained from above and rearranged it into this piece of software.
00009 
00010 I can neigther allow nor forbid the usage of the L1 theory.
00011 The copyright notice below covers not the work of Valery Lainey
00012 but just my work, that is the compilation of the L1 theory
00013 into the software supplied in this file.
00014 
00015 
00016 Copyright (c) 2005 Johannes Gajdosik
00017 
00018 Permission is hereby granted, free of charge, to any person obtaining a
00019 copy of this software and associated documentation files (the "Software"),
00020 to deal in the Software without restriction, including without limitation
00021 the rights to use, copy, modify, merge, publish, distribute, sublicense,
00022 and/or sell copies of the Software, and to permit persons to whom the
00023 Software is furnished to do so, subject to the following conditions:
00024 
00025 The above copyright notice and this permission notice shall be included
00026 in all copies or substantial portions of the Software.
00027 
00028 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00029 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00030 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00031 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00032 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00033 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00034 SOFTWARE.
00035 
00036 This is an implementation of the L1 theory, V1.1.
00037 My modifications are:
00038 1) do not calculate constant terms at runtime but beforehand
00039 2) unite terms with the same frequencies
00040 3) rearrange the terms so that calculation of the argument becomes easier
00041 4) substitute so that the independent variable becomes T=jd-2433282.5
00042 5) artificially blend out the usage of polynomials outside [-695+t0,695+t0]
00043    in order to avoid a discontinuity
00044 
00045 ****************************************************************/
00046 
00047 #ifndef _L1_H_
00048 #define _L1_H_
00049 
00050 #ifdef __cplusplus
00051 extern "C" {
00052 #endif
00053 
00054 #define L1_IO            0
00055 #define L1_EUROPA        1
00056 #define L1_GANYMEDE      2
00057 #define L1_CALLISTO      3
00058 
00059 void GetL1Coor(double jd,int body,double *xyz);
00060   /* Return the rectangular coordinates of the given satellite
00061      and the given julian date jd expressed in dynamical time (TAI+32.184s).
00062      The origin of the xyz-coordinates is the center of the planet.
00063      The reference frame is "dynamical equinox and ecliptic J2000",
00064      which is the reference frame in VSOP87 and VSOP87A.
00065   */
00066 
00067 void GetL1OsculatingCoor(double jd0,double jd,int body,double *xyz);
00068   /* The oculating orbit of epoch jd0, evatuated at jd, is returned.
00069   */
00070 
00071 
00072 #ifdef __cplusplus
00073 }
00074 #endif
00075 
00076 #endif