source: trunk/FACT++/erfa/src/s2c.c@ 18921

Last change on this file since 18921 was 18921, checked in by tbretz, 7 years ago
Updated to ERFA 1.4.0
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) 2013-2017, NumFOCUS Foundation.
19** Derived, with permission, from the SOFA library. See notes at end of file.
20*/
21{
22 double cp;
23
24
25 cp = cos(phi);
26 c[0] = cos(theta) * cp;
27 c[1] = sin(theta) * cp;
28 c[2] = sin(phi);
29
30 return;
31
32}
33/*----------------------------------------------------------------------
34**
35**
36** Copyright (C) 2013-2017, NumFOCUS Foundation.
37** All rights reserved.
38**
39** This library is derived, with permission, from the International
40** Astronomical Union's "Standards of Fundamental Astronomy" library,
41** available from http://www.iausofa.org.
42**
43** The ERFA version is intended to retain identical functionality to
44** the SOFA library, but made distinct through different function and
45** file names, as set out in the SOFA license conditions. The SOFA
46** original has a role as a reference standard for the IAU and IERS,
47** and consequently redistribution is permitted only in its unaltered
48** state. The ERFA version is not subject to this restriction and
49** therefore can be included in distributions which do not support the
50** concept of "read only" software.
51**
52** Although the intent is to replicate the SOFA API (other than
53** replacement of prefix names) and results (with the exception of
54** bugs; any that are discovered will be fixed), SOFA is not
55** responsible for any errors found in this version of the library.
56**
57** If you wish to acknowledge the SOFA heritage, please acknowledge
58** that you are using a library derived from SOFA, rather than SOFA
59** itself.
60**
61**
62** TERMS AND CONDITIONS
63**
64** Redistribution and use in source and binary forms, with or without
65** modification, are permitted provided that the following conditions
66** are met:
67**
68** 1 Redistributions of source code must retain the above copyright
69** notice, this list of conditions and the following disclaimer.
70**
71** 2 Redistributions in binary form must reproduce the above copyright
72** notice, this list of conditions and the following disclaimer in
73** the documentation and/or other materials provided with the
74** distribution.
75**
76** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
77** the International Astronomical Union nor the names of its
78** contributors may be used to endorse or promote products derived
79** from this software without specific prior written permission.
80**
81** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
82** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
83** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
84** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
85** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
86** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
87** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
88** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
89** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
90** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
91** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
92** POSSIBILITY OF SUCH DAMAGE.
93**
94*/
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