source: branches/FACT++_lidctrl_usb/erfa/src/pnm00a.c@ 19875

Last change on this file since 19875 was 18711, checked in by tbretz, 10 years ago
Updated to ERFA 1.3.0 (no relevant code change except the leap second at the beginning of 2017)
File size: 5.2 KB
Line 
1#include "erfa.h"
2
3void eraPnm00a(double date1, double date2, double rbpn[3][3])
4/*
5** - - - - - - - - - -
6** e r a P n m 0 0 a
7** - - - - - - - - - -
8**
9** Form the matrix of precession-nutation for a given date (including
10** frame bias), equinox-based, IAU 2000A model.
11**
12** Given:
13** date1,date2 double TT as a 2-part Julian Date (Note 1)
14**
15** Returned:
16** rbpn double[3][3] classical NPB 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 operates in the sense V(date) = rbpn * V(GCRS), where
40** the p-vector V(date) is with respect to the true equatorial triad
41** of date date1+date2 and the p-vector V(GCRS) is with respect to
42** the Geocentric Celestial Reference System (IAU, 2000).
43**
44** 3) A faster, but slightly less accurate result (about 1 mas), can be
45** obtained by using instead the eraPnm00b function.
46**
47** Called:
48** eraPn00a bias/precession/nutation, IAU 2000A
49**
50** Reference:
51**
52** IAU: Trans. International Astronomical Union, Vol. XXIVB; Proc.
53** 24th General Assembly, Manchester, UK. Resolutions B1.3, B1.6.
54** (2000)
55**
56** Copyright (C) 2013-2016, NumFOCUS Foundation.
57** Derived, with permission, from the SOFA library. See notes at end of file.
58*/
59{
60 double dpsi, deps, epsa, rb[3][3], rp[3][3], rbp[3][3], rn[3][3];
61
62
63/* Obtain the required matrix (discarding other results). */
64 eraPn00a(date1, date2, &dpsi, &deps, &epsa, rb, rp, rbp, rn, rbpn);
65
66 return;
67
68}
69/*----------------------------------------------------------------------
70**
71**
72** Copyright (C) 2013-2016, 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*/
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