File Coverage

erfasrc/src/c2ibpn.c
Criterion Covered Total %
statement 0 4 0.0
branch n/a
condition n/a
subroutine n/a
pod n/a
total 0 4 0.0


line stmt bran cond sub pod time code
1             #include "erfa.h"
2              
3 0           void eraC2ibpn(double date1, double date2, double rbpn[3][3],
4             double rc2i[3][3])
5             /*
6             ** - - - - - - - - - -
7             ** e r a C 2 i b p n
8             ** - - - - - - - - - -
9             **
10             ** Form the celestial-to-intermediate matrix for a given date given
11             ** the bias-precession-nutation matrix. IAU 2000.
12             **
13             ** Given:
14             ** date1,date2 double TT as a 2-part Julian Date (Note 1)
15             ** rbpn double[3][3] celestial-to-true matrix (Note 2)
16             **
17             ** Returned:
18             ** rc2i double[3][3] celestial-to-intermediate matrix (Note 3)
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 rbpn transforms vectors from GCRS to true equator (and
42             ** CIO or equinox) of date. Only the CIP (bottom row) is used.
43             **
44             ** 3) The matrix rc2i is the first stage in the transformation from
45             ** celestial to terrestrial coordinates:
46             **
47             ** [TRS] = RPOM * R_3(ERA) * rc2i * [CRS]
48             **
49             ** = RC2T * [CRS]
50             **
51             ** where [CRS] is a vector in the Geocentric Celestial Reference
52             ** System and [TRS] is a vector in the International Terrestrial
53             ** Reference System (see IERS Conventions 2003), ERA is the Earth
54             ** Rotation Angle and RPOM is the polar motion matrix.
55             **
56             ** 4) Although its name does not include "00", This function is in fact
57             ** specific to the IAU 2000 models.
58             **
59             ** Called:
60             ** eraBpn2xy extract CIP X,Y coordinates from NPB matrix
61             ** eraC2ixy celestial-to-intermediate matrix, given X,Y
62             **
63             ** References:
64             ** "Expressions for the Celestial Intermediate Pole and Celestial
65             ** Ephemeris Origin consistent with the IAU 2000A precession-
66             ** nutation model", Astron.Astrophys. 400, 1145-1154 (2003)
67             **
68             ** n.b. The celestial ephemeris origin (CEO) was renamed "celestial
69             ** intermediate origin" (CIO) by IAU 2006 Resolution 2.
70             **
71             ** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
72             ** IERS Technical Note No. 32, BKG (2004)
73             **
74             ** Copyright (C) 2013-2019, NumFOCUS Foundation.
75             ** Derived, with permission, from the SOFA library. See notes at end of file.
76             */
77             {
78             double x, y;
79              
80              
81             /* Extract the X,Y coordinates. */
82 0           eraBpn2xy(rbpn, &x, &y);
83              
84             /* Form the celestial-to-intermediate matrix (n.b. IAU 2000 specific). */
85 0           eraC2ixy(date1, date2, x, y, rc2i);
86              
87 0           return;
88              
89             }
90             /*----------------------------------------------------------------------
91             **
92             **
93             ** Copyright (C) 2013-2019, 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             */