source: trunk/FACT++/erfa/src/ldsun.c@ 18350

Last change on this file since 18350 was 18348, checked in by tbretz, 9 years ago
File size: 4.1 KB
Line 
1#include "erfa.h"
2
3void eraLdsun(double p[3], double e[3], double em, double p1[3])
4/*
5** - - - - - - - - -
6** e r a L d s u n
7** - - - - - - - - -
8**
9** Deflection of starlight by the Sun.
10**
11** Given:
12** p double[3] direction from observer to star (unit vector)
13** e double[3] direction from Sun to observer (unit vector)
14** em double distance from Sun to observer (au)
15**
16** Returned:
17** p1 double[3] observer to deflected star (unit vector)
18**
19** Notes:
20**
21** 1) The source is presumed to be sufficiently distant that its
22** directions seen from the Sun and the observer are essentially
23** the same.
24**
25** 2) The deflection is restrained when the angle between the star and
26** the center of the Sun is less than about 9 arcsec, falling to
27** zero for zero separation. (The chosen threshold is within the
28** solar limb for all solar-system applications.)
29**
30** 3) The arguments p and p1 can be the same array.
31**
32** Called:
33** eraLd light deflection by a solar-system body
34**
35** Copyright (C) 2013-2015, NumFOCUS Foundation.
36** Derived, with permission, from the SOFA library. See notes at end of file.
37*/
38{
39 eraLd(1.0, p, p, e, em, 1e-9, p1);
40
41/* Finished. */
42
43}
44/*----------------------------------------------------------------------
45**
46**
47** Copyright (C) 2013-2015, NumFOCUS Foundation.
48** All rights reserved.
49**
50** This library is derived, with permission, from the International
51** Astronomical Union's "Standards of Fundamental Astronomy" library,
52** available from http://www.iausofa.org.
53**
54** The ERFA version is intended to retain identical functionality to
55** the SOFA library, but made distinct through different function and
56** file names, as set out in the SOFA license conditions. The SOFA
57** original has a role as a reference standard for the IAU and IERS,
58** and consequently redistribution is permitted only in its unaltered
59** state. The ERFA version is not subject to this restriction and
60** therefore can be included in distributions which do not support the
61** concept of "read only" software.
62**
63** Although the intent is to replicate the SOFA API (other than
64** replacement of prefix names) and results (with the exception of
65** bugs; any that are discovered will be fixed), SOFA is not
66** responsible for any errors found in this version of the library.
67**
68** If you wish to acknowledge the SOFA heritage, please acknowledge
69** that you are using a library derived from SOFA, rather than SOFA
70** itself.
71**
72**
73** TERMS AND CONDITIONS
74**
75** Redistribution and use in source and binary forms, with or without
76** modification, are permitted provided that the following conditions
77** are met:
78**
79** 1 Redistributions of source code must retain the above copyright
80** notice, this list of conditions and the following disclaimer.
81**
82** 2 Redistributions in binary form must reproduce the above copyright
83** notice, this list of conditions and the following disclaimer in
84** the documentation and/or other materials provided with the
85** distribution.
86**
87** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
88** the International Astronomical Union nor the names of its
89** contributors may be used to endorse or promote products derived
90** from this software without specific prior written permission.
91**
92** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
93** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
94** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
95** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
96** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
97** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
98** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
100** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
101** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
102** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
103** POSSIBILITY OF SUCH DAMAGE.
104**
105*/
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