source: trunk/FACT++/erfa/src/s2c.c@ 18348

Last change on this file since 18348 was 18348, checked in by tbretz, 9 years ago
File size: 3.5 KB
Line 
1#include "erfa.h"
2
3void eraS2c(double theta, double phi, double c[3])
4/*
5** - - - - - - -
6** e r a S 2 c
7** - - - - - - -
8**
9** Convert spherical coordinates to Cartesian.
10**
11** Given:
12** theta double longitude angle (radians)
13** phi double latitude angle (radians)
14**
15** Returned:
16** c double[3] direction cosines
17**
18** Copyright (C) 2013-2015, NumFOCUS Foundation.
19** Derived, with permission, from the SOFA library. See notes at end of file.
20*/
21{
22 double cp;
23
24 cp = cos(phi);
25 c[0] = cos(theta) * cp;
26 c[1] = sin(theta) * cp;
27 c[2] = sin(phi);
28
29 return;
30
31}
32/*----------------------------------------------------------------------
33**
34**
35** Copyright (C) 2013-2015, NumFOCUS Foundation.
36** All rights reserved.
37**
38** This library is derived, with permission, from the International
39** Astronomical Union's "Standards of Fundamental Astronomy" library,
40** available from http://www.iausofa.org.
41**
42** The ERFA version is intended to retain identical functionality to
43** the SOFA library, but made distinct through different function and
44** file names, as set out in the SOFA license conditions. The SOFA
45** original has a role as a reference standard for the IAU and IERS,
46** and consequently redistribution is permitted only in its unaltered
47** state. The ERFA version is not subject to this restriction and
48** therefore can be included in distributions which do not support the
49** concept of "read only" software.
50**
51** Although the intent is to replicate the SOFA API (other than
52** replacement of prefix names) and results (with the exception of
53** bugs; any that are discovered will be fixed), SOFA is not
54** responsible for any errors found in this version of the library.
55**
56** If you wish to acknowledge the SOFA heritage, please acknowledge
57** that you are using a library derived from SOFA, rather than SOFA
58** itself.
59**
60**
61** TERMS AND CONDITIONS
62**
63** Redistribution and use in source and binary forms, with or without
64** modification, are permitted provided that the following conditions
65** are met:
66**
67** 1 Redistributions of source code must retain the above copyright
68** notice, this list of conditions and the following disclaimer.
69**
70** 2 Redistributions in binary form must reproduce the above copyright
71** notice, this list of conditions and the following disclaimer in
72** the documentation and/or other materials provided with the
73** distribution.
74**
75** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
76** the International Astronomical Union nor the names of its
77** contributors may be used to endorse or promote products derived
78** from this software without specific prior written permission.
79**
80** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
81** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
82** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
83** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
84** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
85** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
86** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
87** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
88** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
89** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
90** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
91** POSSIBILITY OF SUCH DAMAGE.
92**
93*/
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