File Coverage

erfasrc/src/nutm80.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 eraNutm80(double date1, double date2, double rmatn[3][3])
4		/*
5		** - - - - - - - - - -
6		** e r a N u t m 8 0
7		** - - - - - - - - - -
8		**
9		** Form the matrix of nutation for a given date, IAU 1980 model.
10		**
11		** Given:
12		** date1,date2 double TDB 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),
39		** where the p-vector V(true) is with respect to the true
40		** equatorial triad of date and the p-vector V(mean) is with
41		** respect to the mean equatorial triad of date.
42		**
43		** Called:
44		** eraNut80 nutation, IAU 1980
45		** eraObl80 mean obliquity, IAU 1980
46		** eraNumat form nutation matrix
47		**
48		** Copyright (C) 2013-2020, NumFOCUS Foundation.
49		** Derived, with permission, from the SOFA library. See notes at end of file.
50		*/
51		{
52		double dpsi, deps, epsa;
53
54
55		/* Nutation components and mean obliquity. */
56	0	eraNut80(date1, date2, &dpsi, &deps);
57	0	epsa = eraObl80(date1, date2);
58
59		/* Build the rotation matrix. */
60	0	eraNumat(epsa, dpsi, deps, rmatn);
61
62	0	return;
63
64		}
65		/*----------------------------------------------------------------------
66		**
67		**
68		** Copyright (C) 2013-2020, NumFOCUS Foundation.
69		** All rights reserved.
70		**
71		** This library is derived, with permission, from the International
72		** Astronomical Union's "Standards of Fundamental Astronomy" library,
73		** available from http://www.iausofa.org.
74		**
75		** The ERFA version is intended to retain identical functionality to
76		** the SOFA library, but made distinct through different function and
77		** file names, as set out in the SOFA license conditions. The SOFA
78		** original has a role as a reference standard for the IAU and IERS,
79		** and consequently redistribution is permitted only in its unaltered
80		** state. The ERFA version is not subject to this restriction and
81		** therefore can be included in distributions which do not support the
82		** concept of "read only" software.
83		**
84		** Although the intent is to replicate the SOFA API (other than
85		** replacement of prefix names) and results (with the exception of
86		** bugs; any that are discovered will be fixed), SOFA is not
87		** responsible for any errors found in this version of the library.
88		**
89		** If you wish to acknowledge the SOFA heritage, please acknowledge
90		** that you are using a library derived from SOFA, rather than SOFA
91		** itself.
92		**
93		**
94		** TERMS AND CONDITIONS
95		**
96		** Redistribution and use in source and binary forms, with or without
97		** modification, are permitted provided that the following conditions
98		** are met:
99		**
100		** 1 Redistributions of source code must retain the above copyright
101		** notice, this list of conditions and the following disclaimer.
102		**
103		** 2 Redistributions in binary form must reproduce the above copyright
104		** notice, this list of conditions and the following disclaimer in
105		** the documentation and/or other materials provided with the
106		** distribution.
107		**
108		** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
109		** the International Astronomical Union nor the names of its
110		** contributors may be used to endorse or promote products derived
111		** from this software without specific prior written permission.
112		**
113		** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
114		** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
115		** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
116		** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
117		** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
118		** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
119		** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
120		** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
121		** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
122		** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
123		** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
124		** POSSIBILITY OF SUCH DAMAGE.
125		**
126		*/