1 #include "erfa.h"
2 
eraFad03(double t)3 double 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) 2013-2014, 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) 2013-2014, 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 */
113