FACT++  1.0
faf03.c
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1 #include "erfa.h"
2 
3 double 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) 2013-2015, NumFOCUS Foundation.
36 ** Derived, with permission, from the SOFA library. See notes at end of file.
37 */
38 {
39  double a;
40 
41 /* Mean longitude of the Moon minus that of the ascending node */
42 /* (IERS Conventions 2003). */
43  a = fmod( 335779.526232 +
44  t * ( 1739527262.8478 +
45  t * ( - 12.7512 +
46  t * ( - 0.001037 +
47  t * ( 0.00000417 ) ) ) ), ERFA_TURNAS ) * ERFA_DAS2R;
48 
49  return a;
50 
51 }
52 /*----------------------------------------------------------------------
53 **
54 **
55 ** Copyright (C) 2013-2015, 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 */
ERFA_TURNAS
#define ERFA_TURNAS
Definition: erfam.h:66
ERFA_DAS2R
#define ERFA_DAS2R
Definition: erfam.h:60
eraFaf03
double eraFaf03(double t)
Definition: faf03.c:3
t
TT t
Definition: test_client.c:26