File Coverage

erfasrc/src/num00a.c

Criterion	Covered	Total	%
statement	0	3	0.0
branch			n/a
condition			n/a
subroutine			n/a
pod			n/a
total	0	3	0.0

line	stmt	code
1		#include "erfa.h"
2
3	0	void eraNum00a(double date1, double date2, double rmatn[3][3])
4		/*
5		** - - - - - - - - - -
6		** e r a N u m 0 0 a
7		** - - - - - - - - - -
8		**
9		** Form the matrix of nutation for a given date, IAU 2000A model.
10		**
11		** Given:
12		** date1,date2 double TT as a 2-part Julian Date (Note 1)
13		**
14		** Returned:
15		** rmatn double[3][3] nutation matrix
16		**
17		** Notes:
18		**
19		** 1) The TT date date1+date2 is a Julian Date, apportioned in any
20		** convenient way between the two arguments. For example,
21		** JD(TT)=2450123.7 could be expressed in any of these ways,
22		** among others:
23		**
24		** date1 date2
25		**
26		** 2450123.7 0.0 (JD method)
27		** 2451545.0 -1421.3 (J2000 method)
28		** 2400000.5 50123.2 (MJD method)
29		** 2450123.5 0.2 (date & time method)
30		**
31		** The JD method is the most natural and convenient to use in
32		** cases where the loss of several decimal digits of resolution
33		** is acceptable. The J2000 method is best matched to the way
34		** the argument is handled internally and will deliver the
35		** optimum resolution. The MJD method and the date & time methods
36		** are both good compromises between resolution and convenience.
37		**
38		** 2) The matrix operates in the sense V(true) = rmatn * V(mean), where
39		** the p-vector V(true) is with respect to the true equatorial triad
40		** of date and the p-vector V(mean) is with respect to the mean
41		** equatorial triad of date.
42		**
43		** 3) A faster, but slightly less accurate result (about 1 mas), can be
44		** obtained by using instead the eraNum00b function.
45		**
46		** Called:
47		** eraPn00a bias/precession/nutation, IAU 2000A
48		**
49		** Reference:
50		**
51		** Explanatory Supplement to the Astronomical Almanac,
52		** P. Kenneth Seidelmann (ed), University Science Books (1992),
53		** Section 3.222-3 (p114).
54		**
55		** Copyright (C) 2013-2020, NumFOCUS Foundation.
56		** Derived, with permission, from the SOFA library. See notes at end of file.
57		*/
58		{
59		double dpsi, deps, epsa, rb[3][3], rp[3][3], rbp[3][3], rbpn[3][3];
60
61
62		/* Obtain the required matrix (discarding other results). */
63	0	eraPn00a(date1, date2,
64		&dpsi, &deps, &epsa, rb, rp, rbp, rmatn, rbpn);
65
66	0	return;
67
68		}
69		/*----------------------------------------------------------------------
70		**
71		**
72		** Copyright (C) 2013-2020, NumFOCUS Foundation.
73		** All rights reserved.
74		**
75		** This library is derived, with permission, from the International
76		** Astronomical Union's "Standards of Fundamental Astronomy" library,
77		** available from http://www.iausofa.org.
78		**
79		** The ERFA version is intended to retain identical functionality to
80		** the SOFA library, but made distinct through different function and
81		** file names, as set out in the SOFA license conditions. The SOFA
82		** original has a role as a reference standard for the IAU and IERS,
83		** and consequently redistribution is permitted only in its unaltered
84		** state. The ERFA version is not subject to this restriction and
85		** therefore can be included in distributions which do not support the
86		** concept of "read only" software.
87		**
88		** Although the intent is to replicate the SOFA API (other than
89		** replacement of prefix names) and results (with the exception of
90		** bugs; any that are discovered will be fixed), SOFA is not
91		** responsible for any errors found in this version of the library.
92		**
93		** If you wish to acknowledge the SOFA heritage, please acknowledge
94		** that you are using a library derived from SOFA, rather than SOFA
95		** itself.
96		**
97		**
98		** TERMS AND CONDITIONS
99		**
100		** Redistribution and use in source and binary forms, with or without
101		** modification, are permitted provided that the following conditions
102		** are met:
103		**
104		** 1 Redistributions of source code must retain the above copyright
105		** notice, this list of conditions and the following disclaimer.
106		**
107		** 2 Redistributions in binary form must reproduce the above copyright
108		** notice, this list of conditions and the following disclaimer in
109		** the documentation and/or other materials provided with the
110		** distribution.
111		**
112		** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
113		** the International Astronomical Union nor the names of its
114		** contributors may be used to endorse or promote products derived
115		** from this software without specific prior written permission.
116		**
117		** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
118		** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
119		** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
120		** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
121		** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
122		** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
123		** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
124		** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
125		** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
126		** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
127		** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
128		** POSSIBILITY OF SUCH DAMAGE.
129		**
130		*/