source: trunk/FACT++/erfa/src/fad03.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: 4.2 KB
Line 
1#include "erfa.h"
2
3double eraFad03(double t)
4/*
5** - - - - - - - - -
6** e r a F a d 0 3
7** - - - - - - - - -
8**
9** Fundamental argument, IERS Conventions (2003):
10** mean elongation of the Moon from the Sun.
11**
12** Given:
13** t double TDB, Julian centuries since J2000.0 (Note 1)
14**
15** Returned (function value):
16** double D, 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 elongation of the Moon from the Sun (IERS Conventions 2003). */
42 a = fmod( 1072260.703692 +
43 t * ( 1602961601.2090 +
44 t * ( - 6.3706 +
45 t * ( 0.006593 +
46 t * ( - 0.00003169 ) ) ) ), ERFA_TURNAS ) * ERFA_DAS2R;
47
48 return a;
49
50}
51/*----------------------------------------------------------------------
52**
53**
54** Copyright (C) 2013-2017, NumFOCUS Foundation.
55** All rights reserved.
56**
57** This library is derived, with permission, from the International
58** Astronomical Union's "Standards of Fundamental Astronomy" library,
59** available from http://www.iausofa.org.
60**
61** The ERFA version is intended to retain identical functionality to
62** the SOFA library, but made distinct through different function and
63** file names, as set out in the SOFA license conditions. The SOFA
64** original has a role as a reference standard for the IAU and IERS,
65** and consequently redistribution is permitted only in its unaltered
66** state. The ERFA version is not subject to this restriction and
67** therefore can be included in distributions which do not support the
68** concept of "read only" software.
69**
70** Although the intent is to replicate the SOFA API (other than
71** replacement of prefix names) and results (with the exception of
72** bugs; any that are discovered will be fixed), SOFA is not
73** responsible for any errors found in this version of the library.
74**
75** If you wish to acknowledge the SOFA heritage, please acknowledge
76** that you are using a library derived from SOFA, rather than SOFA
77** itself.
78**
79**
80** TERMS AND CONDITIONS
81**
82** Redistribution and use in source and binary forms, with or without
83** modification, are permitted provided that the following conditions
84** are met:
85**
86** 1 Redistributions of source code must retain the above copyright
87** notice, this list of conditions and the following disclaimer.
88**
89** 2 Redistributions in binary form must reproduce the above copyright
90** notice, this list of conditions and the following disclaimer in
91** the documentation and/or other materials provided with the
92** distribution.
93**
94** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
95** the International Astronomical Union nor the names of its
96** contributors may be used to endorse or promote products derived
97** from this software without specific prior written permission.
98**
99** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
100** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
101** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
102** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
103** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
104** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
105** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
106** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
107** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
108** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
109** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
110** POSSIBILITY OF SUCH DAMAGE.
111**
112*/
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