File Coverage

erfasrc/src/c2i00b.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 eraC2i00b(double date1, double date2, double rc2i[3][3])
4             /*
5             ** - - - - - - - - - -
6             ** e r a C 2 i 0 0 b
7             ** - - - - - - - - - -
8             **
9             ** Form the celestial-to-intermediate matrix for a given date using the
10             ** IAU 2000B precession-nutation model.
11             **
12             ** Given:
13             ** date1,date2 double TT as a 2-part Julian Date (Note 1)
14             **
15             ** Returned:
16             ** rc2i double[3][3] celestial-to-intermediate 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 rc2i is the first stage in the transformation from
40             ** celestial to terrestrial coordinates:
41             **
42             ** [TRS] = RPOM * R_3(ERA) * rc2i * [CRS]
43             **
44             ** = rc2t * [CRS]
45             **
46             ** where [CRS] is a vector in the Geocentric Celestial Reference
47             ** System and [TRS] is a vector in the International Terrestrial
48             ** Reference System (see IERS Conventions 2003), ERA is the Earth
49             ** Rotation Angle and RPOM is the polar motion matrix.
50             **
51             ** 3) The present function is faster, but slightly less accurate (about
52             ** 1 mas), than the eraC2i00a function.
53             **
54             ** Called:
55             ** eraPnm00b classical NPB matrix, IAU 2000B
56             ** eraC2ibpn celestial-to-intermediate matrix, given NPB matrix
57             **
58             ** References:
59             **
60             ** "Expressions for the Celestial Intermediate Pole and Celestial
61             ** Ephemeris Origin consistent with the IAU 2000A precession-
62             ** nutation model", Astron.Astrophys. 400, 1145-1154
63             ** (2003)
64             **
65             ** n.b. The celestial ephemeris origin (CEO) was renamed "celestial
66             ** intermediate origin" (CIO) by IAU 2006 Resolution 2.
67             **
68             ** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
69             ** IERS Technical Note No. 32, BKG (2004)
70             **
71             ** Copyright (C) 2013-2020, NumFOCUS Foundation.
72             ** Derived, with permission, from the SOFA library. See notes at end of file.
73             */
74             {
75             double rbpn[3][3];
76              
77              
78             /* Obtain the celestial-to-true matrix (IAU 2000B). */
79 0           eraPnm00b(date1, date2, rbpn);
80              
81             /* Form the celestial-to-intermediate matrix. */
82 0           eraC2ibpn(date1, date2, rbpn, rc2i);
83              
84 0           return;
85              
86             }
87             /*----------------------------------------------------------------------
88             **
89             **
90             ** Copyright (C) 2013-2020, NumFOCUS Foundation.
91             ** All rights reserved.
92             **
93             ** This library is derived, with permission, from the International
94             ** Astronomical Union's "Standards of Fundamental Astronomy" library,
95             ** available from http://www.iausofa.org.
96             **
97             ** The ERFA version is intended to retain identical functionality to
98             ** the SOFA library, but made distinct through different function and
99             ** file names, as set out in the SOFA license conditions. The SOFA
100             ** original has a role as a reference standard for the IAU and IERS,
101             ** and consequently redistribution is permitted only in its unaltered
102             ** state. The ERFA version is not subject to this restriction and
103             ** therefore can be included in distributions which do not support the
104             ** concept of "read only" software.
105             **
106             ** Although the intent is to replicate the SOFA API (other than
107             ** replacement of prefix names) and results (with the exception of
108             ** bugs; any that are discovered will be fixed), SOFA is not
109             ** responsible for any errors found in this version of the library.
110             **
111             ** If you wish to acknowledge the SOFA heritage, please acknowledge
112             ** that you are using a library derived from SOFA, rather than SOFA
113             ** itself.
114             **
115             **
116             ** TERMS AND CONDITIONS
117             **
118             ** Redistribution and use in source and binary forms, with or without
119             ** modification, are permitted provided that the following conditions
120             ** are met:
121             **
122             ** 1 Redistributions of source code must retain the above copyright
123             ** notice, this list of conditions and the following disclaimer.
124             **
125             ** 2 Redistributions in binary form must reproduce the above copyright
126             ** notice, this list of conditions and the following disclaimer in
127             ** the documentation and/or other materials provided with the
128             ** distribution.
129             **
130             ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
131             ** the International Astronomical Union nor the names of its
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133             ** from this software without specific prior written permission.
134             **
135             ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
136             ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
137             ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
138             ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
139             ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
140             ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
141             ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
142             ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
143             ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
144             ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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148             */