source: trunk/FACT++/erfa/src/pn06a.c@ 18679

Last change on this file since 18679 was 18348, checked in by tbretz, 9 years ago
File size: 6.7 KB
Line 
1#include "erfa.h"
2
3void eraPn06a(double date1, double date2,
4 double *dpsi, double *deps, double *epsa,
5 double rb[3][3], double rp[3][3], double rbp[3][3],
6 double rn[3][3], double rbpn[3][3])
7/*
8** - - - - - - - - -
9** e r a P n 0 6 a
10** - - - - - - - - -
11**
12** Precession-nutation, IAU 2006/2000A models: a multi-purpose function,
13** supporting classical (equinox-based) use directly and CIO-based use
14** indirectly.
15**
16** Given:
17** date1,date2 double TT as a 2-part Julian Date (Note 1)
18**
19** Returned:
20** dpsi,deps double nutation (Note 2)
21** epsa double mean obliquity (Note 3)
22** rb double[3][3] frame bias matrix (Note 4)
23** rp double[3][3] precession matrix (Note 5)
24** rbp double[3][3] bias-precession matrix (Note 6)
25** rn double[3][3] nutation matrix (Note 7)
26** rbpn double[3][3] GCRS-to-true matrix (Notes 8,9)
27**
28** Notes:
29**
30** 1) The TT date date1+date2 is a Julian Date, apportioned in any
31** convenient way between the two arguments. For example,
32** JD(TT)=2450123.7 could be expressed in any of these ways,
33** among others:
34**
35** date1 date2
36**
37** 2450123.7 0.0 (JD method)
38** 2451545.0 -1421.3 (J2000 method)
39** 2400000.5 50123.2 (MJD method)
40** 2450123.5 0.2 (date & time method)
41**
42** The JD method is the most natural and convenient to use in
43** cases where the loss of several decimal digits of resolution
44** is acceptable. The J2000 method is best matched to the way
45** the argument is handled internally and will deliver the
46** optimum resolution. The MJD method and the date & time methods
47** are both good compromises between resolution and convenience.
48**
49** 2) The nutation components (luni-solar + planetary, IAU 2000A) in
50** longitude and obliquity are in radians and with respect to the
51** equinox and ecliptic of date. Free core nutation is omitted;
52** for the utmost accuracy, use the eraPn06 function, where the
53** nutation components are caller-specified.
54**
55** 3) The mean obliquity is consistent with the IAU 2006 precession.
56**
57** 4) The matrix rb transforms vectors from GCRS to mean J2000.0 by
58** applying frame bias.
59**
60** 5) The matrix rp transforms vectors from mean J2000.0 to mean of
61** date by applying precession.
62**
63** 6) The matrix rbp transforms vectors from GCRS to mean of date by
64** applying frame bias then precession. It is the product rp x rb.
65**
66** 7) The matrix rn transforms vectors from mean of date to true of
67** date by applying the nutation (luni-solar + planetary).
68**
69** 8) The matrix rbpn transforms vectors from GCRS to true of date
70** (CIP/equinox). It is the product rn x rbp, applying frame bias,
71** precession and nutation in that order.
72**
73** 9) The X,Y,Z coordinates of the IAU 2006/2000A Celestial
74** Intermediate Pole are elements (3,1-3) of the GCRS-to-true
75** matrix, i.e. rbpn[2][0-2].
76**
77** 10) It is permissible to re-use the same array in the returned
78** arguments. The arrays are filled in the stated order.
79**
80** Called:
81** eraNut06a nutation, IAU 2006/2000A
82** eraPn06 bias/precession/nutation results, IAU 2006
83**
84** Reference:
85**
86** Capitaine, N. & Wallace, P.T., 2006, Astron.Astrophys. 450, 855
87**
88** Copyright (C) 2013-2015, NumFOCUS Foundation.
89** Derived, with permission, from the SOFA library. See notes at end of file.
90*/
91{
92/* Nutation. */
93 eraNut06a(date1, date2, dpsi, deps);
94
95/* Remaining results. */
96 eraPn06(date1, date2, *dpsi, *deps, epsa, rb, rp, rbp, rn, rbpn);
97
98 return;
99
100}
101/*----------------------------------------------------------------------
102**
103**
104** Copyright (C) 2013-2015, NumFOCUS Foundation.
105** All rights reserved.
106**
107** This library is derived, with permission, from the International
108** Astronomical Union's "Standards of Fundamental Astronomy" library,
109** available from http://www.iausofa.org.
110**
111** The ERFA version is intended to retain identical functionality to
112** the SOFA library, but made distinct through different function and
113** file names, as set out in the SOFA license conditions. The SOFA
114** original has a role as a reference standard for the IAU and IERS,
115** and consequently redistribution is permitted only in its unaltered
116** state. The ERFA version is not subject to this restriction and
117** therefore can be included in distributions which do not support the
118** concept of "read only" software.
119**
120** Although the intent is to replicate the SOFA API (other than
121** replacement of prefix names) and results (with the exception of
122** bugs; any that are discovered will be fixed), SOFA is not
123** responsible for any errors found in this version of the library.
124**
125** If you wish to acknowledge the SOFA heritage, please acknowledge
126** that you are using a library derived from SOFA, rather than SOFA
127** itself.
128**
129**
130** TERMS AND CONDITIONS
131**
132** Redistribution and use in source and binary forms, with or without
133** modification, are permitted provided that the following conditions
134** are met:
135**
136** 1 Redistributions of source code must retain the above copyright
137** notice, this list of conditions and the following disclaimer.
138**
139** 2 Redistributions in binary form must reproduce the above copyright
140** notice, this list of conditions and the following disclaimer in
141** the documentation and/or other materials provided with the
142** distribution.
143**
144** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
145** the International Astronomical Union nor the names of its
146** contributors may be used to endorse or promote products derived
147** from this software without specific prior written permission.
148**
149** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
150** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
151** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
152** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
153** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
154** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
155** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
156** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
157** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
158** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
159** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
160** POSSIBILITY OF SUCH DAMAGE.
161**
162*/
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