FACT++  1.0
bp06.c
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1 #include "erfa.h"
2 
3 void eraBp06(double date1, double date2,
4  double rb[3][3], double rp[3][3], double rbp[3][3])
5 /*
6 ** - - - - - - - -
7 ** e r a B p 0 6
8 ** - - - - - - - -
9 **
10 ** Frame bias and precession, IAU 2006.
11 **
12 ** Given:
13 ** date1,date2 double TT as a 2-part Julian Date (Note 1)
14 **
15 ** Returned:
16 ** rb double[3][3] frame bias matrix (Note 2)
17 ** rp double[3][3] precession matrix (Note 3)
18 ** rbp double[3][3] bias-precession matrix (Note 4)
19 **
20 ** Notes:
21 **
22 ** 1) The TT date date1+date2 is a Julian Date, apportioned in any
23 ** convenient way between the two arguments. For example,
24 ** JD(TT)=2450123.7 could be expressed in any of these ways,
25 ** among others:
26 **
27 ** date1 date2
28 **
29 ** 2450123.7 0.0 (JD method)
30 ** 2451545.0 -1421.3 (J2000 method)
31 ** 2400000.5 50123.2 (MJD method)
32 ** 2450123.5 0.2 (date & time method)
33 **
34 ** The JD method is the most natural and convenient to use in
35 ** cases where the loss of several decimal digits of resolution
36 ** is acceptable. The J2000 method is best matched to the way
37 ** the argument is handled internally and will deliver the
38 ** optimum resolution. The MJD method and the date & time methods
39 ** are both good compromises between resolution and convenience.
40 **
41 ** 2) The matrix rb transforms vectors from GCRS to mean J2000.0 by
42 ** applying frame bias.
43 **
44 ** 3) The matrix rp transforms vectors from mean J2000.0 to mean of
45 ** date by applying precession.
46 **
47 ** 4) The matrix rbp transforms vectors from GCRS to mean of date by
48 ** applying frame bias then precession. It is the product rp x rb.
49 **
50 ** 5) It is permissible to re-use the same array in the returned
51 ** arguments. The arrays are filled in the order given.
52 **
53 ** Called:
54 ** eraPfw06 bias-precession F-W angles, IAU 2006
55 ** eraFw2m F-W angles to r-matrix
56 ** eraPmat06 PB matrix, IAU 2006
57 ** eraTr transpose r-matrix
58 ** eraRxr product of two r-matrices
59 ** eraCr copy r-matrix
60 **
61 ** References:
62 **
63 ** Capitaine, N. & Wallace, P.T., 2006, Astron.Astrophys. 450, 855
64 **
65 ** Wallace, P.T. & Capitaine, N., 2006, Astron.Astrophys. 459, 981
66 **
67 ** Copyright (C) 2013-2015, NumFOCUS Foundation.
68 ** Derived, with permission, from the SOFA library. See notes at end of file.
69 */
70 {
71  double gamb, phib, psib, epsa, rbpw[3][3], rbt[3][3];
72 
73 /* B matrix. */
74  eraPfw06(ERFA_DJM0, ERFA_DJM00, &gamb, &phib, &psib, &epsa);
75  eraFw2m(gamb, phib, psib, epsa, rb);
76 
77 /* PxB matrix (temporary). */
78  eraPmat06(date1, date2, rbpw);
79 
80 /* P matrix. */
81  eraTr(rb, rbt);
82  eraRxr(rbpw, rbt, rp);
83 
84 /* PxB matrix. */
85  eraCr(rbpw, rbp);
86 
87  return;
88 
89 }
90 /*----------------------------------------------------------------------
91 **
92 **
93 ** Copyright (C) 2013-2015, NumFOCUS Foundation.
94 ** All rights reserved.
95 **
96 ** This library is derived, with permission, from the International
97 ** Astronomical Union's "Standards of Fundamental Astronomy" library,
98 ** available from http://www.iausofa.org.
99 **
100 ** The ERFA version is intended to retain identical functionality to
101 ** the SOFA library, but made distinct through different function and
102 ** file names, as set out in the SOFA license conditions. The SOFA
103 ** original has a role as a reference standard for the IAU and IERS,
104 ** and consequently redistribution is permitted only in its unaltered
105 ** state. The ERFA version is not subject to this restriction and
106 ** therefore can be included in distributions which do not support the
107 ** concept of "read only" software.
108 **
109 ** Although the intent is to replicate the SOFA API (other than
110 ** replacement of prefix names) and results (with the exception of
111 ** bugs; any that are discovered will be fixed), SOFA is not
112 ** responsible for any errors found in this version of the library.
113 **
114 ** If you wish to acknowledge the SOFA heritage, please acknowledge
115 ** that you are using a library derived from SOFA, rather than SOFA
116 ** itself.
117 **
118 **
119 ** TERMS AND CONDITIONS
120 **
121 ** Redistribution and use in source and binary forms, with or without
122 ** modification, are permitted provided that the following conditions
123 ** are met:
124 **
125 ** 1 Redistributions of source code must retain the above copyright
126 ** notice, this list of conditions and the following disclaimer.
127 **
128 ** 2 Redistributions in binary form must reproduce the above copyright
129 ** notice, this list of conditions and the following disclaimer in
130 ** the documentation and/or other materials provided with the
131 ** distribution.
132 **
133 ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
134 ** the International Astronomical Union nor the names of its
135 ** contributors may be used to endorse or promote products derived
136 ** from this software without specific prior written permission.
137 **
138 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
139 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
140 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
141 ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
142 ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
143 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
144 ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
145 ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
146 ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
147 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
148 ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
149 ** POSSIBILITY OF SUCH DAMAGE.
150 **
151 */
void eraPmat06(double date1, double date2, double rbp[3][3])
Definition: pmat06.c:3
void eraPfw06(double date1, double date2, double *gamb, double *phib, double *psib, double *epsa)
Definition: pfw06.c:3
#define ERFA_DJM00
Definition: erfam.h:93
void eraFw2m(double gamb, double phib, double psi, double eps, double r[3][3])
Definition: fw2m.c:3
#define ERFA_DJM0
Definition: erfam.h:90
void eraCr(double r[3][3], double c[3][3])
Definition: cr.c:3
void eraRxr(double a[3][3], double b[3][3], double atb[3][3])
Definition: rxr.c:3
void eraBp06(double date1, double date2, double rb[3][3], double rp[3][3], double rbp[3][3])
Definition: bp06.c:3
void eraTr(double r[3][3], double rt[3][3])
Definition: tr.c:3