File Coverage

erfasrc/src/tcgtt.c
Criterion Covered Total %
statement 0 7 0.0
branch 0 2 0.0
condition n/a
subroutine n/a
pod n/a
total 0 9 0.0


line stmt bran cond sub pod time code
1             #include "erfa.h"
2              
3 0           int eraTcgtt(double tcg1, double tcg2, double *tt1, double *tt2)
4             /*
5             ** - - - - - - - - -
6             ** e r a T c g t t
7             ** - - - - - - - - -
8             **
9             ** Time scale transformation: Geocentric Coordinate Time, TCG, to
10             ** Terrestrial Time, TT.
11             **
12             ** Given:
13             ** tcg1,tcg2 double TCG as a 2-part Julian Date
14             **
15             ** Returned:
16             ** tt1,tt2 double TT as a 2-part Julian Date
17             **
18             ** Returned (function value):
19             ** int status: 0 = OK
20             **
21             ** Note:
22             **
23             ** tcg1+tcg2 is Julian Date, apportioned in any convenient way
24             ** between the two arguments, for example where tcg1 is the Julian
25             ** Day Number and tcg22 is the fraction of a day. The returned
26             ** tt1,tt2 follow suit.
27             **
28             ** References:
29             **
30             ** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),.
31             ** IERS Technical Note No. 32, BKG (2004)
32             **
33             ** IAU 2000 Resolution B1.9
34             **
35             ** Copyright (C) 2013-2019, NumFOCUS Foundation.
36             ** Derived, with permission, from the SOFA library. See notes at end of file.
37             */
38             {
39              
40             /* 1977 Jan 1 00:00:32.184 TT, as MJD */
41             static const double t77t = ERFA_DJM77 + ERFA_TTMTAI/ERFA_DAYSEC;
42              
43              
44             /* Result, safeguarding precision. */
45 0 0         if ( tcg1 > tcg2 ) {
46 0           *tt1 = tcg1;
47 0           *tt2 = tcg2 - ( ( tcg1 - ERFA_DJM0 ) + ( tcg2 - t77t ) ) * ERFA_ELG;
48             } else {
49 0           *tt1 = tcg1 - ( ( tcg2 - ERFA_DJM0 ) + ( tcg1 - t77t ) ) * ERFA_ELG;
50 0           *tt2 = tcg2;
51             }
52              
53             /* OK status. */
54 0           return 0;
55              
56             }
57             /*----------------------------------------------------------------------
58             **
59             **
60             ** Copyright (C) 2013-2019, NumFOCUS Foundation.
61             ** All rights reserved.
62             **
63             ** This library is derived, with permission, from the International
64             ** Astronomical Union's "Standards of Fundamental Astronomy" library,
65             ** available from http://www.iausofa.org.
66             **
67             ** The ERFA version is intended to retain identical functionality to
68             ** the SOFA library, but made distinct through different function and
69             ** file names, as set out in the SOFA license conditions. The SOFA
70             ** original has a role as a reference standard for the IAU and IERS,
71             ** and consequently redistribution is permitted only in its unaltered
72             ** state. The ERFA version is not subject to this restriction and
73             ** therefore can be included in distributions which do not support the
74             ** concept of "read only" software.
75             **
76             ** Although the intent is to replicate the SOFA API (other than
77             ** replacement of prefix names) and results (with the exception of
78             ** bugs; any that are discovered will be fixed), SOFA is not
79             ** responsible for any errors found in this version of the library.
80             **
81             ** If you wish to acknowledge the SOFA heritage, please acknowledge
82             ** that you are using a library derived from SOFA, rather than SOFA
83             ** itself.
84             **
85             **
86             ** TERMS AND CONDITIONS
87             **
88             ** Redistribution and use in source and binary forms, with or without
89             ** modification, are permitted provided that the following conditions
90             ** are met:
91             **
92             ** 1 Redistributions of source code must retain the above copyright
93             ** notice, this list of conditions and the following disclaimer.
94             **
95             ** 2 Redistributions in binary form must reproduce the above copyright
96             ** notice, this list of conditions and the following disclaimer in
97             ** the documentation and/or other materials provided with the
98             ** distribution.
99             **
100             ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
101             ** the International Astronomical Union nor the names of its
102             ** contributors may be used to endorse or promote products derived
103             ** from this software without specific prior written permission.
104             **
105             ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
106             ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
107             ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
108             ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
109             ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
110             ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
111             ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
112             ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
113             ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
114             ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
115             ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
116             ** POSSIBILITY OF SUCH DAMAGE.
117             **
118             */