source: trunk/FACT++/erfa/src/fasa03.c@ 18679

Last change on this file since 18679 was 18348, checked in by tbretz, 9 years ago
File size: 4.2 KB
Line 
1#include "erfa.h"
2
3double eraFasa03(double t)
4/*
5** - - - - - - - - - -
6** e r a F a s a 0 3
7** - - - - - - - - - -
8**
9** Fundamental argument, IERS Conventions (2003):
10** mean longitude of Saturn.
11**
12** Given:
13** t double TDB, Julian centuries since J2000.0 (Note 1)
14**
15** Returned (function value):
16** double mean longitude of Saturn, 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** comes from Souchay et al. (1999) after 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** Souchay, J., Loysel, B., Kinoshita, H., Folgueira, M. 1999,
35** Astron.Astrophys.Supp.Ser. 135, 111
36**
37** Copyright (C) 2013-2015, NumFOCUS Foundation.
38** Derived, with permission, from the SOFA library. See notes at end of file.
39*/
40{
41 double a;
42
43/* Mean longitude of Saturn (IERS Conventions 2003). */
44 a = fmod(0.874016757 + 21.3299104960 * t, ERFA_D2PI);
45
46 return a;
47
48}
49/*----------------------------------------------------------------------
50**
51**
52** Copyright (C) 2013-2015, NumFOCUS Foundation.
53** All rights reserved.
54**
55** This library is derived, with permission, from the International
56** Astronomical Union's "Standards of Fundamental Astronomy" library,
57** available from http://www.iausofa.org.
58**
59** The ERFA version is intended to retain identical functionality to
60** the SOFA library, but made distinct through different function and
61** file names, as set out in the SOFA license conditions. The SOFA
62** original has a role as a reference standard for the IAU and IERS,
63** and consequently redistribution is permitted only in its unaltered
64** state. The ERFA version is not subject to this restriction and
65** therefore can be included in distributions which do not support the
66** concept of "read only" software.
67**
68** Although the intent is to replicate the SOFA API (other than
69** replacement of prefix names) and results (with the exception of
70** bugs; any that are discovered will be fixed), SOFA is not
71** responsible for any errors found in this version of the library.
72**
73** If you wish to acknowledge the SOFA heritage, please acknowledge
74** that you are using a library derived from SOFA, rather than SOFA
75** itself.
76**
77**
78** TERMS AND CONDITIONS
79**
80** Redistribution and use in source and binary forms, with or without
81** modification, are permitted provided that the following conditions
82** are met:
83**
84** 1 Redistributions of source code must retain the above copyright
85** notice, this list of conditions and the following disclaimer.
86**
87** 2 Redistributions in binary form must reproduce the above copyright
88** notice, this list of conditions and the following disclaimer in
89** the documentation and/or other materials provided with the
90** distribution.
91**
92** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
93** the International Astronomical Union nor the names of its
94** contributors may be used to endorse or promote products derived
95** from this software without specific prior written permission.
96**
97** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
98** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
99** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
100** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
101** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
102** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
103** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
104** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
105** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
107** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
108** POSSIBILITY OF SUCH DAMAGE.
109**
110*/
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