FACT++  1.0
fapa03.c
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1 #include "erfa.h"
2 
3 double eraFapa03(double t)
4 /*
5 ** - - - - - - - - - -
6 ** e r a F a p a 0 3
7 ** - - - - - - - - - -
8 **
9 ** Fundamental argument, IERS Conventions (2003):
10 ** general accumulated precession in longitude.
11 **
12 ** Given:
13 ** t double TDB, Julian centuries since J2000.0 (Note 1)
14 **
15 ** Returned (function value):
16 ** double general precession in longitude, 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). It
24 ** is taken from Kinoshita & Souchay (1990) and comes originally
25 ** from Lieske et al. (1977).
26 **
27 ** References:
28 **
29 ** Kinoshita, H. and Souchay J. 1990, Celest.Mech. and Dyn.Astron.
30 ** 48, 187
31 **
32 ** Lieske, J.H., Lederle, T., Fricke, W. & Morando, B. 1977,
33 ** Astron.Astrophys. 58, 1-16
34 **
35 ** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
36 ** IERS Technical Note No. 32, BKG (2004)
37 **
38 ** Copyright (C) 2013-2015, NumFOCUS Foundation.
39 ** Derived, with permission, from the SOFA library. See notes at end of file.
40 */
41 {
42  double a;
43 
44 /* General accumulated precession in longitude. */
45  a = (0.024381750 + 0.00000538691 * t) * t;
46 
47  return a;
48 
49 }
50 /*----------------------------------------------------------------------
51 **
52 **
53 ** Copyright (C) 2013-2015, NumFOCUS Foundation.
54 ** All rights reserved.
55 **
56 ** This library is derived, with permission, from the International
57 ** Astronomical Union's "Standards of Fundamental Astronomy" library,
58 ** available from http://www.iausofa.org.
59 **
60 ** The ERFA version is intended to retain identical functionality to
61 ** the SOFA library, but made distinct through different function and
62 ** file names, as set out in the SOFA license conditions. The SOFA
63 ** original has a role as a reference standard for the IAU and IERS,
64 ** and consequently redistribution is permitted only in its unaltered
65 ** state. The ERFA version is not subject to this restriction and
66 ** therefore can be included in distributions which do not support the
67 ** concept of "read only" software.
68 **
69 ** Although the intent is to replicate the SOFA API (other than
70 ** replacement of prefix names) and results (with the exception of
71 ** bugs; any that are discovered will be fixed), SOFA is not
72 ** responsible for any errors found in this version of the library.
73 **
74 ** If you wish to acknowledge the SOFA heritage, please acknowledge
75 ** that you are using a library derived from SOFA, rather than SOFA
76 ** itself.
77 **
78 **
79 ** TERMS AND CONDITIONS
80 **
81 ** Redistribution and use in source and binary forms, with or without
82 ** modification, are permitted provided that the following conditions
83 ** are met:
84 **
85 ** 1 Redistributions of source code must retain the above copyright
86 ** notice, this list of conditions and the following disclaimer.
87 **
88 ** 2 Redistributions in binary form must reproduce the above copyright
89 ** notice, this list of conditions and the following disclaimer in
90 ** the documentation and/or other materials provided with the
91 ** distribution.
92 **
93 ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
94 ** the International Astronomical Union nor the names of its
95 ** contributors may be used to endorse or promote products derived
96 ** from this software without specific prior written permission.
97 **
98 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
99 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
100 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
101 ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
102 ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
103 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
104 ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
105 ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
106 ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
107 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
108 ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
109 ** POSSIBILITY OF SUCH DAMAGE.
110 **
111 */
eraFapa03
double eraFapa03(double t)
Definition: fapa03.c:3
t
TT t
Definition: test_client.c:26