| 1 | /*
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| 2 | *+
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| 3 | * Name:
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| 4 | * palPrenut
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| 5 |
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| 6 | * Purpose:
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| 7 | * Form the matrix of bias-precession-nutation (IAU 2006/2000A)
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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 palPrenut( double epoch, double date, double rmatpn[3][3] )
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| 17 |
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| 18 | * Arguments:
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| 19 | * epoch = double (Returned)
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| 20 | * Julian epoch for mean coordinates.
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| 21 | * date = double (Returned)
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| 22 | * Modified Julian Date (JD-2400000.5) for true coordinates.
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| 23 | * rmatpn = double[3][3] (Returned)
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| 24 | * combined NPB matrix
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| 25 |
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| 26 | * Description:
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| 27 | * Form the matrix of bias-precession-nutation (IAU 2006/2000A).
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| 28 | * The epoch and date are TT (but TDB is usually close enough).
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| 29 | * The matrix is in the sense v(true) = rmatpn * v(mean).
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| 30 |
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| 31 | * Authors:
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| 32 | * PTW: Pat Wallace (STFC)
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| 33 | * {enter_new_authors_here}
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| 34 |
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| 35 | * History:
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| 36 | * 2012-02-10 (PTW):
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| 37 | * Initial version.
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| 38 | * Adapted with permission from the Fortran SLALIB library.
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| 39 | * {enter_further_changes_here}
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| 40 |
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| 41 | * Copyright:
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| 42 | * Copyright (C) 2012 Science and Technology Facilities Council.
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| 43 | * All Rights Reserved.
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| 44 |
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| 45 | * Licence:
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| 46 | * This program is free software: you can redistribute it and/or
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| 47 | * modify it under the terms of the GNU Lesser General Public
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| 48 | * License as published by the Free Software Foundation, either
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| 49 | * version 3 of the License, or (at your option) any later
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| 50 | * version.
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| 51 | *
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| 52 | * This program is distributed in the hope that it will be useful,
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| 53 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 54 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 55 | * GNU Lesser General Public License for more details.
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| 56 | *
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| 57 | * You should have received a copy of the GNU Lesser General
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| 58 | * License along with this program. If not, see
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| 59 | * <http://www.gnu.org/licenses/>.
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| 60 |
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| 61 | * Bugs:
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| 62 | * {note_any_bugs_here}
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| 63 | *-
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| 64 | */
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| 65 |
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| 66 | #include "pal.h"
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| 67 | #include "palmac.h"
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| 68 | #include "pal1sofa.h"
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| 69 |
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| 70 | void palPrenut ( double epoch, double date, double rmatpn[3][3] ){
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| 71 |
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| 72 | /* Local Variables: */
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| 73 | double bpa;
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| 74 | double bpia;
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| 75 | double bqa;
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| 76 | double chia;
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| 77 | double d1;
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| 78 | double d2;
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| 79 | double eps0;
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| 80 | double epsa;
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| 81 | double gam;
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| 82 | double oma;
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| 83 | double pa;
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| 84 | double phi;
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| 85 | double pia;
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| 86 | double psi;
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| 87 | double psia;
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| 88 | double r1[3][3];
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| 89 | double r2[3][3];
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| 90 | double thetaa;
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| 91 | double za;
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| 92 | double zetaa;
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| 93 |
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| 94 | /* Specified Julian epoch as a 2-part JD. */
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| 95 | eraEpj2jd( epoch, &d1, &d2 );
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| 96 |
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| 97 | /* P matrix, from specified epoch to J2000.0. */
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| 98 | eraP06e( d1, d2, &eps0, &psia, &oma, &bpa, &bqa, &pia, &bpia, &epsa,
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| 99 | &chia, &za, &zetaa, &thetaa, &pa, &gam, &phi, &psi );
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| 100 | eraIr( r1 );
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| 101 | eraRz( -chia, r1 );
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| 102 | eraRx( oma, r1 );
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| 103 | eraRz( psia, r1 );
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| 104 | eraRx( -eps0, r1 );
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| 105 |
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| 106 | /* NPB matrix, from J2000.0 to date. */
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| 107 | eraPnm06a( PAL__MJD0, date, r2 );
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| 108 |
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| 109 | /* NPB matrix, from specified epoch to date. */
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| 110 | eraRxr( r2, r1, rmatpn );
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| 111 | }
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