FACT++  1.0
faom03.c
Go to the documentation of this file.
1 #include "erfa.h"
2 
3 double 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) 2013-2015, NumFOCUS Foundation.
35 ** Derived, with permission, from the SOFA library. See notes at end of file.
36 */
37 {
38  double a;
39 
40 /* Mean longitude of the Moon's ascending node */
41 /* (IERS Conventions 2003). */
42  a = fmod( 450160.398036 +
43  t * ( - 6962890.5431 +
44  t * ( 7.4722 +
45  t * ( 0.007702 +
46  t * ( - 0.00005939 ) ) ) ), ERFA_TURNAS ) * ERFA_DAS2R;
47 
48  return a;
49 
50 }
51 /*----------------------------------------------------------------------
52 **
53 **
54 ** Copyright (C) 2013-2015, 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 */
ERFA_TURNAS
#define ERFA_TURNAS
Definition: erfam.h:66
ERFA_DAS2R
#define ERFA_DAS2R
Definition: erfam.h:60
t
TT t
Definition: test_client.c:26
eraFaom03
double eraFaom03(double t)
Definition: faom03.c:3