File Coverage

erfasrc/src/bi00.c

Criterion	Covered	Total	%
statement	0	5	0.0
branch			n/a
condition			n/a
subroutine			n/a
pod			n/a
total	0	5	0.0

line	stmt	code
1		#include "erfa.h"
2
3	0	void eraBi00(double dpsibi, double depsbi, double *dra)
4		/*
5		** - - - - - - - -
6		** e r a B i 0 0
7		** - - - - - - - -
8		**
9		** Frame bias components of IAU 2000 precession-nutation models (part
10		** of MHB2000 with additions).
11		**
12		** Returned:
13		** dpsibi,depsbi double longitude and obliquity corrections
14		** dra double the ICRS RA of the J2000.0 mean equinox
15		**
16		** Notes:
17		**
18		** 1) The frame bias corrections in longitude and obliquity (radians)
19		** are required in order to correct for the offset between the GCRS
20		** pole and the mean J2000.0 pole. They define, with respect to the
21		** GCRS frame, a J2000.0 mean pole that is consistent with the rest
22		** of the IAU 2000A precession-nutation model.
23		**
24		** 2) In addition to the displacement of the pole, the complete
25		** description of the frame bias requires also an offset in right
26		** ascension. This is not part of the IAU 2000A model, and is from
27		** Chapront et al. (2002). It is returned in radians.
28		**
29		** 3) This is a supplemented implementation of one aspect of the IAU
30		** 2000A nutation model, formally adopted by the IAU General
31		** Assembly in 2000, namely MHB2000 (Mathews et al. 2002).
32		**
33		** References:
34		**
35		** Chapront, J., Chapront-Touze, M. & Francou, G., Astron.
36		** Astrophys., 387, 700, 2002.
37		**
38		** Mathews, P.M., Herring, T.A., Buffet, B.A., "Modeling of nutation
39		** and precession New nutation series for nonrigid Earth and
40		** insights into the Earth's interior", J.Geophys.Res., 107, B4,
41		** 2002. The MHB2000 code itself was obtained on 9th September 2002
42		** from ftp://maia.usno.navy.mil/conv2000/chapter5/IAU2000A.
43		**
44		** Copyright (C) 2013-2020, NumFOCUS Foundation.
45		** Derived, with permission, from the SOFA library. See notes at end of file.
46		*/
47		{
48		/* The frame bias corrections in longitude and obliquity */
49		const double DPBIAS = -0.041775 * ERFA_DAS2R,
50		DEBIAS = -0.0068192 * ERFA_DAS2R;
51
52		/* The ICRS RA of the J2000.0 equinox (Chapront et al., 2002) */
53		const double DRA0 = -0.0146 * ERFA_DAS2R;
54
55
56		/* Return the results (which are fixed). */
57	0	*dpsibi = DPBIAS;
58	0	*depsbi = DEBIAS;
59	0	*dra = DRA0;
60
61	0	return;
62
63		}
64		/*----------------------------------------------------------------------
65		**
66		**
67		** Copyright (C) 2013-2020, NumFOCUS Foundation.
68		** All rights reserved.
69		**
70		** This library is derived, with permission, from the International
71		** Astronomical Union's "Standards of Fundamental Astronomy" library,
72		** available from http://www.iausofa.org.
73		**
74		** The ERFA version is intended to retain identical functionality to
75		** the SOFA library, but made distinct through different function and
76		** file names, as set out in the SOFA license conditions. The SOFA
77		** original has a role as a reference standard for the IAU and IERS,
78		** and consequently redistribution is permitted only in its unaltered
79		** state. The ERFA version is not subject to this restriction and
80		** therefore can be included in distributions which do not support the
81		** concept of "read only" software.
82		**
83		** Although the intent is to replicate the SOFA API (other than
84		** replacement of prefix names) and results (with the exception of
85		** bugs; any that are discovered will be fixed), SOFA is not
86		** responsible for any errors found in this version of the library.
87		**
88		** If you wish to acknowledge the SOFA heritage, please acknowledge
89		** that you are using a library derived from SOFA, rather than SOFA
90		** itself.
91		**
92		**
93		** TERMS AND CONDITIONS
94		**
95		** Redistribution and use in source and binary forms, with or without
96		** modification, are permitted provided that the following conditions
97		** are met:
98		**
99		** 1 Redistributions of source code must retain the above copyright
100		** notice, this list of conditions and the following disclaimer.
101		**
102		** 2 Redistributions in binary form must reproduce the above copyright
103		** notice, this list of conditions and the following disclaimer in
104		** the documentation and/or other materials provided with the
105		** distribution.
106		**
107		** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
108		** the International Astronomical Union nor the names of its
109		** contributors may be used to endorse or promote products derived
110		** from this software without specific prior written permission.
111		**
112		** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
113		** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
114		** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
115		** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
116		** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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120		** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
121		** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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123		** POSSIBILITY OF SUCH DAMAGE.
124		**
125		*/