source: branches/FACT++_lidctrl_usb/erfa/src/epj2jd.c@ 19875

Last change on this file since 19875 was 18711, checked in by tbretz, 10 years ago
Updated to ERFA 1.3.0 (no relevant code change except the leap second at the beginning of 2017)
File size: 3.8 KB
Line 
1#include "erfa.h"
2
3void 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) 2013-2016, 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) 2013-2016, 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*/
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