source: trunk/FACT++/erfa/src/eors.c@ 18350

Last change on this file since 18350 was 18348, checked in by tbretz, 9 years ago
File size: 4.5 KB
Line 
1#include "erfa.h"
2
3double eraEors(double rnpb[3][3], double s)
4/*
5** - - - - - - - -
6** e r a E o r s
7** - - - - - - - -
8**
9** Equation of the origins, given the classical NPB matrix and the
10** quantity s.
11**
12** Given:
13** rnpb double[3][3] classical nutation x precession x bias matrix
14** s double the quantity s (the CIO locator)
15**
16** Returned (function value):
17** double the equation of the origins in radians.
18**
19** Notes:
20**
21** 1) The equation of the origins is the distance between the true
22** equinox and the celestial intermediate origin and, equivalently,
23** the difference between Earth rotation angle and Greenwich
24** apparent sidereal time (ERA-GST). It comprises the precession
25** (since J2000.0) in right ascension plus the equation of the
26** equinoxes (including the small correction terms).
27**
28** 2) The algorithm is from Wallace & Capitaine (2006).
29**
30** References:
31**
32** Capitaine, N. & Wallace, P.T., 2006, Astron.Astrophys. 450, 855
33**
34** Wallace, P. & Capitaine, N., 2006, Astron.Astrophys. 459, 981
35**
36** Copyright (C) 2013-2015, NumFOCUS Foundation.
37** Derived, with permission, from the SOFA library. See notes at end of file.
38*/
39{
40 double x, ax, xs, ys, zs, p, q, eo;
41
42/* Evaluate Wallace & Capitaine (2006) expression (16). */
43 x = rnpb[2][0];
44 ax = x / (1.0 + rnpb[2][2]);
45 xs = 1.0 - ax * x;
46 ys = -ax * rnpb[2][1];
47 zs = -x;
48 p = rnpb[0][0] * xs + rnpb[0][1] * ys + rnpb[0][2] * zs;
49 q = rnpb[1][0] * xs + rnpb[1][1] * ys + rnpb[1][2] * zs;
50 eo = ((p != 0) || (q != 0)) ? s - atan2(q, p) : s;
51
52 return eo;
53
54}
55/*----------------------------------------------------------------------
56**
57**
58** Copyright (C) 2013-2015, NumFOCUS Foundation.
59** All rights reserved.
60**
61** This library is derived, with permission, from the International
62** Astronomical Union's "Standards of Fundamental Astronomy" library,
63** available from http://www.iausofa.org.
64**
65** The ERFA version is intended to retain identical functionality to
66** the SOFA library, but made distinct through different function and
67** file names, as set out in the SOFA license conditions. The SOFA
68** original has a role as a reference standard for the IAU and IERS,
69** and consequently redistribution is permitted only in its unaltered
70** state. The ERFA version is not subject to this restriction and
71** therefore can be included in distributions which do not support the
72** concept of "read only" software.
73**
74** Although the intent is to replicate the SOFA API (other than
75** replacement of prefix names) and results (with the exception of
76** bugs; any that are discovered will be fixed), SOFA is not
77** responsible for any errors found in this version of the library.
78**
79** If you wish to acknowledge the SOFA heritage, please acknowledge
80** that you are using a library derived from SOFA, rather than SOFA
81** itself.
82**
83**
84** TERMS AND CONDITIONS
85**
86** Redistribution and use in source and binary forms, with or without
87** modification, are permitted provided that the following conditions
88** are met:
89**
90** 1 Redistributions of source code must retain the above copyright
91** notice, this list of conditions and the following disclaimer.
92**
93** 2 Redistributions in binary form must reproduce the above copyright
94** notice, this list of conditions and the following disclaimer in
95** the documentation and/or other materials provided with the
96** distribution.
97**
98** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
99** the International Astronomical Union nor the names of its
100** contributors may be used to endorse or promote products derived
101** from this software without specific prior written permission.
102**
103** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
104** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
105** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
106** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
107** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
108** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
109** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
110** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
111** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
112** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
113** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
114** POSSIBILITY OF SUCH DAMAGE.
115**
116*/
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