File Coverage

erfasrc/src/aper.c
Criterion Covered Total %
statement 0 3 0.0
branch n/a
condition n/a
subroutine n/a
pod n/a
total 0 3 0.0


line stmt bran cond sub pod time code
1             #include "erfa.h"
2              
3 0           void eraAper(double theta, eraASTROM *astrom)
4             /*
5             ** - - - - - - - -
6             ** e r a A p e r
7             ** - - - - - - - -
8             **
9             ** In the star-independent astrometry parameters, update only the
10             ** Earth rotation angle, supplied by the caller explicitly.
11             **
12             ** Given:
13             ** theta double Earth rotation angle (radians, Note 2)
14             ** astrom eraASTROM* star-independent astrometry parameters:
15             ** pmt double not used
16             ** eb double[3] not used
17             ** eh double[3] not used
18             ** em double not used
19             ** v double[3] not used
20             ** bm1 double not used
21             ** bpn double[3][3] not used
22             ** along double longitude + s' (radians)
23             ** xpl double not used
24             ** ypl double not used
25             ** sphi double not used
26             ** cphi double not used
27             ** diurab double not used
28             ** eral double not used
29             ** refa double not used
30             ** refb double not used
31             **
32             ** Returned:
33             ** astrom eraASTROM* star-independent astrometry parameters:
34             ** pmt double unchanged
35             ** eb double[3] unchanged
36             ** eh double[3] unchanged
37             ** em double unchanged
38             ** v double[3] unchanged
39             ** bm1 double unchanged
40             ** bpn double[3][3] unchanged
41             ** along double unchanged
42             ** xpl double unchanged
43             ** ypl double unchanged
44             ** sphi double unchanged
45             ** cphi double unchanged
46             ** diurab double unchanged
47             ** eral double "local" Earth rotation angle (radians)
48             ** refa double unchanged
49             ** refb double unchanged
50             **
51             ** Notes:
52             **
53             ** 1) This function exists to enable sidereal-tracking applications to
54             ** avoid wasteful recomputation of the bulk of the astrometry
55             ** parameters: only the Earth rotation is updated.
56             **
57             ** 2) For targets expressed as equinox based positions, such as
58             ** classical geocentric apparent (RA,Dec), the supplied theta can be
59             ** Greenwich apparent sidereal time rather than Earth rotation
60             ** angle.
61             **
62             ** 3) The function eraAper13 can be used instead of the present
63             ** function, and starts from UT1 rather than ERA itself.
64             **
65             ** 4) This is one of several functions that inserts into the astrom
66             ** structure star-independent parameters needed for the chain of
67             ** astrometric transformations ICRS <-> GCRS <-> CIRS <-> observed.
68             **
69             ** The various functions support different classes of observer and
70             ** portions of the transformation chain:
71             **
72             ** functions observer transformation
73             **
74             ** eraApcg eraApcg13 geocentric ICRS <-> GCRS
75             ** eraApci eraApci13 terrestrial ICRS <-> CIRS
76             ** eraApco eraApco13 terrestrial ICRS <-> observed
77             ** eraApcs eraApcs13 space ICRS <-> GCRS
78             ** eraAper eraAper13 terrestrial update Earth rotation
79             ** eraApio eraApio13 terrestrial CIRS <-> observed
80             **
81             ** Those with names ending in "13" use contemporary ERFA models to
82             ** compute the various ephemerides. The others accept ephemerides
83             ** supplied by the caller.
84             **
85             ** The transformation from ICRS to GCRS covers space motion,
86             ** parallax, light deflection, and aberration. From GCRS to CIRS
87             ** comprises frame bias and precession-nutation. From CIRS to
88             ** observed takes account of Earth rotation, polar motion, diurnal
89             ** aberration and parallax (unless subsumed into the ICRS <-> GCRS
90             ** transformation), and atmospheric refraction.
91             **
92             ** Copyright (C) 2013-2020, NumFOCUS Foundation.
93             ** Derived, with permission, from the SOFA library. See notes at end of file.
94             */
95             {
96 0           astrom->eral = theta + astrom->along;
97              
98             /* Finished. */
99              
100 0           }
101             /*----------------------------------------------------------------------
102             **
103             **
104             ** Copyright (C) 2013-2020, NumFOCUS Foundation.
105             ** All rights reserved.
106             **
107             ** This library is derived, with permission, from the International
108             ** Astronomical Union's "Standards of Fundamental Astronomy" library,
109             ** available from http://www.iausofa.org.
110             **
111             ** The ERFA version is intended to retain identical functionality to
112             ** the SOFA library, but made distinct through different function and
113             ** file names, as set out in the SOFA license conditions. The SOFA
114             ** original has a role as a reference standard for the IAU and IERS,
115             ** and consequently redistribution is permitted only in its unaltered
116             ** state. The ERFA version is not subject to this restriction and
117             ** therefore can be included in distributions which do not support the
118             ** concept of "read only" software.
119             **
120             ** Although the intent is to replicate the SOFA API (other than
121             ** replacement of prefix names) and results (with the exception of
122             ** bugs; any that are discovered will be fixed), SOFA is not
123             ** responsible for any errors found in this version of the library.
124             **
125             ** If you wish to acknowledge the SOFA heritage, please acknowledge
126             ** that you are using a library derived from SOFA, rather than SOFA
127             ** itself.
128             **
129             **
130             ** TERMS AND CONDITIONS
131             **
132             ** Redistribution and use in source and binary forms, with or without
133             ** modification, are permitted provided that the following conditions
134             ** are met:
135             **
136             ** 1 Redistributions of source code must retain the above copyright
137             ** notice, this list of conditions and the following disclaimer.
138             **
139             ** 2 Redistributions in binary form must reproduce the above copyright
140             ** notice, this list of conditions and the following disclaimer in
141             ** the documentation and/or other materials provided with the
142             ** distribution.
143             **
144             ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
145             ** the International Astronomical Union nor the names of its
146             ** contributors may be used to endorse or promote products derived
147             ** from this software without specific prior written permission.
148             **
149             ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
150             ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
151             ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
152             ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
153             ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
154             ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
155             ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
156             ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
157             ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
158             ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
159             ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
160             ** POSSIBILITY OF SUCH DAMAGE.
161             **
162             */