FACT++  1.0
epj2jd.c
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1 #include "erfa.h"
2 
3 void eraEpj2jd(double epj, double *djm0, double *djm)
4 /*
5 ** - - - - - - - - - -
6 ** e r a E p j 2 j d
7 ** - - - - - - - - - -
8 **
9 ** Julian Epoch to Julian Date.
10 **
11 ** Given:
12 ** epj double Julian Epoch (e.g. 1996.8)
13 **
14 ** Returned:
15 ** djm0 double MJD zero-point: always 2400000.5
16 ** djm double Modified Julian Date
17 **
18 ** Note:
19 **
20 ** The Julian Date is returned in two pieces, in the usual ERFA
21 ** manner, which is designed to preserve time resolution. The
22 ** Julian Date is available as a single number by adding djm0 and
23 ** djm.
24 **
25 ** Reference:
26 **
27 ** Lieske, J.H., 1979, Astron.Astrophys. 73, 282.
28 **
29 ** Copyright (C) 2013-2015, NumFOCUS Foundation.
30 ** Derived, with permission, from the SOFA library. See notes at end of file.
31 */
32 {
33  *djm0 = ERFA_DJM0;
34  *djm = ERFA_DJM00 + (epj - 2000.0) * 365.25;
35 
36  return;
37 
38 }
39 /*----------------------------------------------------------------------
40 **
41 **
42 ** Copyright (C) 2013-2015, NumFOCUS Foundation.
43 ** All rights reserved.
44 **
45 ** This library is derived, with permission, from the International
46 ** Astronomical Union's "Standards of Fundamental Astronomy" library,
47 ** available from http://www.iausofa.org.
48 **
49 ** The ERFA version is intended to retain identical functionality to
50 ** the SOFA library, but made distinct through different function and
51 ** file names, as set out in the SOFA license conditions. The SOFA
52 ** original has a role as a reference standard for the IAU and IERS,
53 ** and consequently redistribution is permitted only in its unaltered
54 ** state. The ERFA version is not subject to this restriction and
55 ** therefore can be included in distributions which do not support the
56 ** concept of "read only" software.
57 **
58 ** Although the intent is to replicate the SOFA API (other than
59 ** replacement of prefix names) and results (with the exception of
60 ** bugs; any that are discovered will be fixed), SOFA is not
61 ** responsible for any errors found in this version of the library.
62 **
63 ** If you wish to acknowledge the SOFA heritage, please acknowledge
64 ** that you are using a library derived from SOFA, rather than SOFA
65 ** itself.
66 **
67 **
68 ** TERMS AND CONDITIONS
69 **
70 ** Redistribution and use in source and binary forms, with or without
71 ** modification, are permitted provided that the following conditions
72 ** are met:
73 **
74 ** 1 Redistributions of source code must retain the above copyright
75 ** notice, this list of conditions and the following disclaimer.
76 **
77 ** 2 Redistributions in binary form must reproduce the above copyright
78 ** notice, this list of conditions and the following disclaimer in
79 ** the documentation and/or other materials provided with the
80 ** distribution.
81 **
82 ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
83 ** the International Astronomical Union nor the names of its
84 ** contributors may be used to endorse or promote products derived
85 ** from this software without specific prior written permission.
86 **
87 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
88 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
89 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
90 ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
91 ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
92 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
93 ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
94 ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
95 ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
96 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
97 ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
98 ** POSSIBILITY OF SUCH DAMAGE.
99 **
100 */
#define ERFA_DJM00
Definition: erfam.h:93
void eraEpj2jd(double epj, double *djm0, double *djm)
Definition: epj2jd.c:3
#define ERFA_DJM0
Definition: erfam.h:90