File Coverage

erfasrc/src/pnm80.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 eraPnm80(double date1, double date2, double rmatpn[3][3])
4		/*
5		** - - - - - - - - -
6		** e r a P n m 8 0
7		** - - - - - - - - -
8		**
9		** Form the matrix of precession/nutation for a given date, IAU 1976
10		** precession model, IAU 1980 nutation model.
11		**
12		** Given:
13		** date1,date2 double TDB date (Note 1)
14		**
15		** Returned:
16		** rmatpn double[3][3] combined precession/nutation matrix
17		**
18		** Notes:
19		**
20		** 1) The TDB date date1+date2 is a Julian Date, apportioned in any
21		** convenient way between the two arguments. For example,
22		** JD(TDB)=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 operates in the sense V(date) = rmatpn * V(J2000),
40		** where the p-vector V(date) is with respect to the true equatorial
41		** triad of date date1+date2 and the p-vector V(J2000) is with
42		** respect to the mean equatorial triad of epoch J2000.0.
43		**
44		** Called:
45		** eraPmat76 precession matrix, IAU 1976
46		** eraNutm80 nutation matrix, IAU 1980
47		** eraRxr product of two r-matrices
48		**
49		** Reference:
50		**
51		** Explanatory Supplement to the Astronomical Almanac,
52		** P. Kenneth Seidelmann (ed), University Science Books (1992),
53		** Section 3.3 (p145).
54		**
55		** Copyright (C) 2013-2019, NumFOCUS Foundation.
56		** Derived, with permission, from the SOFA library. See notes at end of file.
57		*/
58		{
59		double rmatp[3][3], rmatn[3][3];
60
61
62		/* Precession matrix, J2000.0 to date. */
63	0	eraPmat76(date1, date2, rmatp);
64
65		/* Nutation matrix. */
66	0	eraNutm80(date1, date2, rmatn);
67
68		/* Combine the matrices: PN = N x P. */
69	0	eraRxr(rmatn, rmatp, rmatpn);
70
71	0	return;
72
73		}
74		/*----------------------------------------------------------------------
75		**
76		**
77		** Copyright (C) 2013-2019, NumFOCUS Foundation.
78		** All rights reserved.
79		**
80		** This library is derived, with permission, from the International
81		** Astronomical Union's "Standards of Fundamental Astronomy" library,
82		** available from http://www.iausofa.org.
83		**
84		** The ERFA version is intended to retain identical functionality to
85		** the SOFA library, but made distinct through different function and
86		** file names, as set out in the SOFA license conditions. The SOFA
87		** original has a role as a reference standard for the IAU and IERS,
88		** and consequently redistribution is permitted only in its unaltered
89		** state. The ERFA version is not subject to this restriction and
90		** therefore can be included in distributions which do not support the
91		** concept of "read only" software.
92		**
93		** Although the intent is to replicate the SOFA API (other than
94		** replacement of prefix names) and results (with the exception of
95		** bugs; any that are discovered will be fixed), SOFA is not
96		** responsible for any errors found in this version of the library.
97		**
98		** If you wish to acknowledge the SOFA heritage, please acknowledge
99		** that you are using a library derived from SOFA, rather than SOFA
100		** itself.
101		**
102		**
103		** TERMS AND CONDITIONS
104		**
105		** Redistribution and use in source and binary forms, with or without
106		** modification, are permitted provided that the following conditions
107		** are met:
108		**
109		** 1 Redistributions of source code must retain the above copyright
110		** notice, this list of conditions and the following disclaimer.
111		**
112		** 2 Redistributions in binary form must reproduce the above copyright
113		** notice, this list of conditions and the following disclaimer in
114		** the documentation and/or other materials provided with the
115		** distribution.
116		**
117		** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
118		** the International Astronomical Union nor the names of its
119		** contributors may be used to endorse or promote products derived
120		** from this software without specific prior written permission.
121		**
122		** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
123		** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
124		** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
125		** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
126		** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
127		** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
128		** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
129		** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
130		** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
131		** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
132		** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
133		** POSSIBILITY OF SUCH DAMAGE.
134		**
135		*/