source: branches/FACT++_lidctrl_usb/erfa/src/fad03.c@ 19875

Last change on this file since 19875 was 18711, checked in by tbretz, 10 years ago
Updated to ERFA 1.3.0 (no relevant code change except the leap second at the beginning of 2017)
File size: 4.2 KB
Line 
1#include "erfa.h"
2
3double 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) 2013-2016, 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) 2013-2016, 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*/
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