1 #include "erfa.h"
2
eraPmat06(double date1,double date2,double rbp[3][3])3 void eraPmat06(double date1, double date2, double rbp[3][3])
4 /*
5 ** - - - - - - - - - -
6 ** e r a P m a t 0 6
7 ** - - - - - - - - - -
8 **
9 ** Precession matrix (including frame bias) from GCRS to a specified
10 ** date, IAU 2006 model.
11 **
12 ** Given:
13 ** date1,date2 double TT as a 2-part Julian Date (Note 1)
14 **
15 ** Returned:
16 ** rbp double[3][3] bias-precession matrix (Note 2)
17 **
18 ** Notes:
19 **
20 ** 1) The TT date date1+date2 is a Julian Date, apportioned in any
21 ** convenient way between the two arguments. For example,
22 ** JD(TT)=2450123.7 could be expressed in any of these ways,
23 ** among others:
24 **
25 ** date1 date2
26 **
27 ** 2450123.7 0.0 (JD method)
28 ** 2451545.0 -1421.3 (J2000 method)
29 ** 2400000.5 50123.2 (MJD method)
30 ** 2450123.5 0.2 (date & time method)
31 **
32 ** The JD method is the most natural and convenient to use in
33 ** cases where the loss of several decimal digits of resolution
34 ** is acceptable. The J2000 method is best matched to the way
35 ** the argument is handled internally and will deliver the
36 ** optimum resolution. The MJD method and the date & time methods
37 ** are both good compromises between resolution and convenience.
38 **
39 ** 2) The matrix operates in the sense V(date) = rbp * V(GCRS), where
40 ** the p-vector V(GCRS) is with respect to the Geocentric Celestial
41 ** Reference System (IAU, 2000) and the p-vector V(date) is with
42 ** respect to the mean equatorial triad of the given date.
43 **
44 ** Called:
45 ** eraPfw06 bias-precession F-W angles, IAU 2006
46 ** eraFw2m F-W angles to r-matrix
47 **
48 ** References:
49 **
50 ** Capitaine, N. & Wallace, P.T., 2006, Astron.Astrophys. 450, 855
51 **
52 ** Wallace, P.T. & Capitaine, N., 2006, Astron.Astrophys. 459, 981
53 **
54 ** Copyright (C) 2013-2014, NumFOCUS Foundation.
55 ** Derived, with permission, from the SOFA library. See notes at end of file.
56 */
57 {
58 double gamb, phib, psib, epsa;
59
60
61 /* Bias-precession Fukushima-Williams angles. */
62 eraPfw06(date1, date2, &gamb, &phib, &psib, &epsa);
63
64 /* Form the matrix. */
65 eraFw2m(gamb, phib, psib, epsa, rbp);
66
67 return;
68
69 }
70 /*----------------------------------------------------------------------
71 **
72 **
73 ** Copyright (C) 2013-2014, NumFOCUS Foundation.
74 ** All rights reserved.
75 **
76 ** This library is derived, with permission, from the International
77 ** Astronomical Union's "Standards of Fundamental Astronomy" library,
78 ** available from http://www.iausofa.org.
79 **
80 ** The ERFA version is intended to retain identical functionality to
81 ** the SOFA library, but made distinct through different function and
82 ** file names, as set out in the SOFA license conditions. The SOFA
83 ** original has a role as a reference standard for the IAU and IERS,
84 ** and consequently redistribution is permitted only in its unaltered
85 ** state. The ERFA version is not subject to this restriction and
86 ** therefore can be included in distributions which do not support the
87 ** concept of "read only" software.
88 **
89 ** Although the intent is to replicate the SOFA API (other than
90 ** replacement of prefix names) and results (with the exception of
91 ** bugs; any that are discovered will be fixed), SOFA is not
92 ** responsible for any errors found in this version of the library.
93 **
94 ** If you wish to acknowledge the SOFA heritage, please acknowledge
95 ** that you are using a library derived from SOFA, rather than SOFA
96 ** itself.
97 **
98 **
99 ** TERMS AND CONDITIONS
100 **
101 ** Redistribution and use in source and binary forms, with or without
102 ** modification, are permitted provided that the following conditions
103 ** are met:
104 **
105 ** 1 Redistributions of source code must retain the above copyright
106 ** notice, this list of conditions and the following disclaimer.
107 **
108 ** 2 Redistributions in binary form must reproduce the above copyright
109 ** notice, this list of conditions and the following disclaimer in
110 ** the documentation and/or other materials provided with the
111 ** distribution.
112 **
113 ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
114 ** the International Astronomical Union nor the names of its
115 ** contributors may be used to endorse or promote products derived
116 ** from this software without specific prior written permission.
117 **
118 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
119 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
120 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
121 ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
122 ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
123 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
124 ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
125 ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
126 ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
127 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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129 ** POSSIBILITY OF SUCH DAMAGE.
130 **
131 */
132