source: trunk/FACT++/erfa/src/faom03.c@ 19594

Last change on this file since 19594 was 18921, checked in by tbretz, 8 years ago
Updated to ERFA 1.4.0
File size: 4.3 KB
Line 
1#include "erfa.h"
2
3double eraFaom03(double t)
4/*
5** - - - - - - - - - -
6** e r a F a o m 0 3
7** - - - - - - - - - -
8**
9** Fundamental argument, IERS Conventions (2003):
10** mean longitude of the Moon's ascending node.
11**
12** Given:
13** t double TDB, Julian centuries since J2000.0 (Note 1)
14**
15** Returned (function value):
16** double Omega, radians (Note 2)
17**
18** Notes:
19**
20** 1) Though t is strictly TDB, it is usually more convenient to use
21** TT, which makes no significant difference.
22**
23** 2) The expression used is as adopted in IERS Conventions (2003) and
24** is from Simon et al. (1994).
25**
26** References:
27**
28** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
29** IERS Technical Note No. 32, BKG (2004)
30**
31** Simon, J.-L., Bretagnon, P., Chapront, J., Chapront-Touze, M.,
32** Francou, G., Laskar, J. 1994, Astron.Astrophys. 282, 663-683
33**
34** Copyright (C) 2013-2017, NumFOCUS Foundation.
35** Derived, with permission, from the SOFA library. See notes at end of file.
36*/
37{
38 double a;
39
40
41/* Mean longitude of the Moon's ascending node */
42/* (IERS Conventions 2003). */
43 a = fmod( 450160.398036 +
44 t * ( - 6962890.5431 +
45 t * ( 7.4722 +
46 t * ( 0.007702 +
47 t * ( - 0.00005939 ) ) ) ), ERFA_TURNAS ) * ERFA_DAS2R;
48
49 return a;
50
51}
52/*----------------------------------------------------------------------
53**
54**
55** Copyright (C) 2013-2017, NumFOCUS Foundation.
56** All rights reserved.
57**
58** This library is derived, with permission, from the International
59** Astronomical Union's "Standards of Fundamental Astronomy" library,
60** available from http://www.iausofa.org.
61**
62** The ERFA version is intended to retain identical functionality to
63** the SOFA library, but made distinct through different function and
64** file names, as set out in the SOFA license conditions. The SOFA
65** original has a role as a reference standard for the IAU and IERS,
66** and consequently redistribution is permitted only in its unaltered
67** state. The ERFA version is not subject to this restriction and
68** therefore can be included in distributions which do not support the
69** concept of "read only" software.
70**
71** Although the intent is to replicate the SOFA API (other than
72** replacement of prefix names) and results (with the exception of
73** bugs; any that are discovered will be fixed), SOFA is not
74** responsible for any errors found in this version of the library.
75**
76** If you wish to acknowledge the SOFA heritage, please acknowledge
77** that you are using a library derived from SOFA, rather than SOFA
78** itself.
79**
80**
81** TERMS AND CONDITIONS
82**
83** Redistribution and use in source and binary forms, with or without
84** modification, are permitted provided that the following conditions
85** are met:
86**
87** 1 Redistributions of source code must retain the above copyright
88** notice, this list of conditions and the following disclaimer.
89**
90** 2 Redistributions in binary form must reproduce the above copyright
91** notice, this list of conditions and the following disclaimer in
92** the documentation and/or other materials provided with the
93** distribution.
94**
95** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
96** the International Astronomical Union nor the names of its
97** contributors may be used to endorse or promote products derived
98** from this software without specific prior written permission.
99**
100** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
101** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
102** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
103** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
104** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
105** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
106** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
107** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
108** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
109** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
110** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
111** POSSIBILITY OF SUCH DAMAGE.
112**
113*/
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