source: trunk/FACT++/erfa/src/faf03.c

Last change on this file was 18921, checked in by tbretz, 7 years ago
Updated to ERFA 1.4.0
File size: 4.3 KB
Line 
1#include "erfa.h"
2
3double eraFaf03(double t)
4/*
5** - - - - - - - - -
6** e r a F a f 0 3
7** - - - - - - - - -
8**
9** Fundamental argument, IERS Conventions (2003):
10** mean longitude of the Moon minus mean longitude of the ascending
11** node.
12**
13** Given:
14** t double TDB, Julian centuries since J2000.0 (Note 1)
15**
16** Returned (function value):
17** double F, radians (Note 2)
18**
19** Notes:
20**
21** 1) Though t is strictly TDB, it is usually more convenient to use
22** TT, which makes no significant difference.
23**
24** 2) The expression used is as adopted in IERS Conventions (2003) and
25** is from Simon et al. (1994).
26**
27** References:
28**
29** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
30** IERS Technical Note No. 32, BKG (2004)
31**
32** Simon, J.-L., Bretagnon, P., Chapront, J., Chapront-Touze, M.,
33** Francou, G., Laskar, J. 1994, Astron.Astrophys. 282, 663-683
34**
35** Copyright (C) 2013-2017, NumFOCUS Foundation.
36** Derived, with permission, from the SOFA library. See notes at end of file.
37*/
38{
39 double a;
40
41
42/* Mean longitude of the Moon minus that of the ascending node */
43/* (IERS Conventions 2003). */
44 a = fmod( 335779.526232 +
45 t * ( 1739527262.8478 +
46 t * ( - 12.7512 +
47 t * ( - 0.001037 +
48 t * ( 0.00000417 ) ) ) ), ERFA_TURNAS ) * ERFA_DAS2R;
49
50 return a;
51
52
53}
54/*----------------------------------------------------------------------
55**
56**
57** Copyright (C) 2013-2017, NumFOCUS Foundation.
58** All rights reserved.
59**
60** This library is derived, with permission, from the International
61** Astronomical Union's "Standards of Fundamental Astronomy" library,
62** available from http://www.iausofa.org.
63**
64** The ERFA version is intended to retain identical functionality to
65** the SOFA library, but made distinct through different function and
66** file names, as set out in the SOFA license conditions. The SOFA
67** original has a role as a reference standard for the IAU and IERS,
68** and consequently redistribution is permitted only in its unaltered
69** state. The ERFA version is not subject to this restriction and
70** therefore can be included in distributions which do not support the
71** concept of "read only" software.
72**
73** Although the intent is to replicate the SOFA API (other than
74** replacement of prefix names) and results (with the exception of
75** bugs; any that are discovered will be fixed), SOFA is not
76** responsible for any errors found in this version of the library.
77**
78** If you wish to acknowledge the SOFA heritage, please acknowledge
79** that you are using a library derived from SOFA, rather than SOFA
80** itself.
81**
82**
83** TERMS AND CONDITIONS
84**
85** Redistribution and use in source and binary forms, with or without
86** modification, are permitted provided that the following conditions
87** are met:
88**
89** 1 Redistributions of source code must retain the above copyright
90** notice, this list of conditions and the following disclaimer.
91**
92** 2 Redistributions in binary form must reproduce the above copyright
93** notice, this list of conditions and the following disclaimer in
94** the documentation and/or other materials provided with the
95** distribution.
96**
97** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
98** the International Astronomical Union nor the names of its
99** contributors may be used to endorse or promote products derived
100** from this software without specific prior written permission.
101**
102** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
103** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
104** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
105** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
106** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
107** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
108** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
109** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
110** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
111** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
112** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
113** POSSIBILITY OF SUCH DAMAGE.
114**
115*/
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