source: trunk/FACT++/erfa/src/fapa03.c@ 19713

Last change on this file since 19713 was 18921, checked in by tbretz, 7 years ago
Updated to ERFA 1.4.0
File size: 4.2 KB
Line 
1#include "erfa.h"
2
3double 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) 2013-2017, NumFOCUS Foundation.
39** Derived, with permission, from the SOFA library. See notes at end of file.
40*/
41{
42 double a;
43
44
45/* General accumulated precession in longitude. */
46 a = (0.024381750 + 0.00000538691 * t) * t;
47
48 return a;
49
50}
51/*----------------------------------------------------------------------
52**
53**
54** Copyright (C) 2013-2017, 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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