source: branches/FACT++_lidctrl_new_eth/erfa/src/nutm80.c

Last change on this file was 18711, checked in by tbretz, 8 years ago
Updated to ERFA 1.3.0 (no relevant code change except the leap second at the beginning of 2017)
File size: 4.9 KB
Line 
1#include "erfa.h"
2
3void 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) 2013-2016, 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 eraNut80(date1, date2, &dpsi, &deps);
57 epsa = eraObl80(date1, date2);
58
59/* Build the rotation matrix. */
60 eraNumat(epsa, dpsi, deps, rmatn);
61
62 return;
63
64}
65/*----------------------------------------------------------------------
66**
67**
68** Copyright (C) 2013-2016, 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*/
Note: See TracBrowser for help on using the repository browser.