FACT++  1.0
s2c.c
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1 #include "erfa.h"
2 
3 void 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 */
eraS2c
void eraS2c(double theta, double phi, double c[3])
Definition: s2c.c:3