| 1 | /*
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| 2 | *+
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| 3 | * Name:
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| 4 | * palEpv
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| 5 |
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| 6 | * Purpose:
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| 7 | * Earth position and velocity with respect to the BCRS
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| 8 |
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| 9 | * Language:
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| 10 | * Starlink ANSI C
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| 11 |
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| 12 | * Type of Module:
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| 13 | * Library routine
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| 14 |
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| 15 | * Invocation:
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| 16 | * void palEpv( double date, double ph[3], double vh[3],
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| 17 | * double pb[3], double vb[3] );
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| 18 |
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| 19 | * Arguments:
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| 20 | * date = double (Given)
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| 21 | * Date, TDB Modified Julian Date (JD-2400000.5)
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| 22 | * ph = double [3] (Returned)
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| 23 | * Heliocentric Earth position (AU)
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| 24 | * vh = double [3] (Returned)
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| 25 | * Heliocentric Earth velocity (AU/day)
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| 26 | * pb = double [3] (Returned)
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| 27 | * Barycentric Earth position (AU)
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| 28 | * vb = double [3] (Returned)
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| 29 | * Barycentric Earth velocity (AU/day)
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| 30 |
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| 31 | * Description:
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| 32 | * Earth position and velocity, heliocentric and barycentric, with
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| 33 | * respect to the Barycentric Celestial Reference System.
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| 34 |
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| 35 | * Authors:
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| 36 | * TIMJ: Tim Jenness (JAC, Hawaii)
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| 37 | * {enter_new_authors_here}
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| 38 |
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| 39 | * Notes:
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| 40 | * - See eraEpv00 for details on accuracy
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| 41 | * - Note that the status argument from eraEpv00 is ignored
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| 42 |
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| 43 | * History:
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| 44 | * 2012-03-12 (TIMJ):
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| 45 | * Initial version
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| 46 | * Adapted with permission from the Fortran SLALIB library
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| 47 | * but now mainly calls SOFA routines.
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| 48 | * {enter_further_changes_here}
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| 49 |
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| 50 | * Copyright:
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| 51 | * Copyright (C) 2012 Science and Technology Facilities Council.
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| 52 | * All Rights Reserved.
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| 53 |
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| 54 | * Licence:
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| 55 | * This program is free software; you can redistribute it and/or
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| 56 | * modify it under the terms of the GNU General Public License as
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| 57 | * published by the Free Software Foundation; either version 3 of
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| 58 | * the License, or (at your option) any later version.
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| 59 | *
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| 60 | * This program is distributed in the hope that it will be
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| 61 | * useful, but WITHOUT ANY WARRANTY; without even the implied
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| 62 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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| 63 | * PURPOSE. See the GNU General Public License for more details.
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| 64 | *
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| 65 | * You should have received a copy of the GNU General Public License
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| 66 | * along with this program; if not, write to the Free Software
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| 67 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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| 68 | * MA 02110-1301, USA.
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| 69 |
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| 70 | * Bugs:
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| 71 | * {note_any_bugs_here}
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| 72 | *-
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| 73 | */
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| 74 |
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| 75 | #include "palmac.h"
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| 76 | #include "pal.h"
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| 77 | #include "pal1sofa.h"
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| 78 |
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| 79 | void palEpv( double date, double ph[3], double vh[3],
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| 80 | double pb[3], double vb[3] ) {
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| 81 |
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| 82 | int i;
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| 83 | double pvh[2][3];
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| 84 | double pvb[2][3];
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| 85 |
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| 86 | eraEpv00( PAL__MJD0, date, pvh, pvb );
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| 87 |
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| 88 | /* Copy into output arrays */
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| 89 | for (i=0; i<3; i++) {
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| 90 | ph[i] = pvh[0][i];
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| 91 | vh[i] = pvh[1][i];
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| 92 | pb[i] = pvb[0][i];
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| 93 | vb[i] = pvb[1][i];
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| 94 | }
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| 95 |
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| 96 | }
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