File Coverage

erfasrc/src/apcg.c

Criterion	Covered	Total	%
statement	0	4	0.0
branch			n/a
condition			n/a
subroutine			n/a
pod			n/a
total	0	4	0.0

line	stmt	code
1		#include "erfa.h"
2
3	0	void eraApcg(double date1, double date2,
4		double ebpv[2][3], double ehp[3],
5		eraASTROM *astrom)
6		/*
7		** - - - - - - - -
8		** e r a A p c g
9		** - - - - - - - -
10		**
11		** For a geocentric observer, prepare star-independent astrometry
12		** parameters for transformations between ICRS and GCRS coordinates.
13		** The Earth ephemeris is supplied by the caller.
14		**
15		** The parameters produced by this function are required in the
16		** parallax, light deflection and aberration parts of the astrometric
17		** transformation chain.
18		**
19		** Given:
20		** date1 double TDB as a 2-part...
21		** date2 double ...Julian Date (Note 1)
22		** ebpv double[2][3] Earth barycentric pos/vel (au, au/day)
23		** ehp double[3] Earth heliocentric position (au)
24		**
25		** Returned:
26		** astrom eraASTROM* star-independent astrometry parameters:
27		** pmt double PM time interval (SSB, Julian years)
28		** eb double[3] SSB to observer (vector, au)
29		** eh double[3] Sun to observer (unit vector)
30		** em double distance from Sun to observer (au)
31		** v double[3] barycentric observer velocity (vector, c)
32		** bm1 double sqrt(1-\|v\|^2): reciprocal of Lorenz factor
33		** bpn double[3][3] bias-precession-nutation matrix
34		** along double unchanged
35		** xpl double unchanged
36		** ypl double unchanged
37		** sphi double unchanged
38		** cphi double unchanged
39		** diurab double unchanged
40		** eral double unchanged
41		** refa double unchanged
42		** refb double unchanged
43		**
44		** Notes:
45		**
46		** 1) The TDB date date1+date2 is a Julian Date, apportioned in any
47		** convenient way between the two arguments. For example,
48		** JD(TDB)=2450123.7 could be expressed in any of these ways, among
49		** others:
50		**
51		** date1 date2
52		**
53		** 2450123.7 0.0 (JD method)
54		** 2451545.0 -1421.3 (J2000 method)
55		** 2400000.5 50123.2 (MJD method)
56		** 2450123.5 0.2 (date & time method)
57		**
58		** The JD method is the most natural and convenient to use in cases
59		** where the loss of several decimal digits of resolution is
60		** acceptable. The J2000 method is best matched to the way the
61		** argument is handled internally and will deliver the optimum
62		** resolution. The MJD method and the date & time methods are both
63		** good compromises between resolution and convenience. For most
64		** applications of this function the choice will not be at all
65		** critical.
66		**
67		** TT can be used instead of TDB without any significant impact on
68		** accuracy.
69		**
70		** 2) All the vectors are with respect to BCRS axes.
71		**
72		** 3) This is one of several functions that inserts into the astrom
73		** structure star-independent parameters needed for the chain of
74		** astrometric transformations ICRS <-> GCRS <-> CIRS <-> observed.
75		**
76		** The various functions support different classes of observer and
77		** portions of the transformation chain:
78		**
79		** functions observer transformation
80		**
81		** eraApcg eraApcg13 geocentric ICRS <-> GCRS
82		** eraApci eraApci13 terrestrial ICRS <-> CIRS
83		** eraApco eraApco13 terrestrial ICRS <-> observed
84		** eraApcs eraApcs13 space ICRS <-> GCRS
85		** eraAper eraAper13 terrestrial update Earth rotation
86		** eraApio eraApio13 terrestrial CIRS <-> observed
87		**
88		** Those with names ending in "13" use contemporary ERFA models to
89		** compute the various ephemerides. The others accept ephemerides
90		** supplied by the caller.
91		**
92		** The transformation from ICRS to GCRS covers space motion,
93		** parallax, light deflection, and aberration. From GCRS to CIRS
94		** comprises frame bias and precession-nutation. From CIRS to
95		** observed takes account of Earth rotation, polar motion, diurnal
96		** aberration and parallax (unless subsumed into the ICRS <-> GCRS
97		** transformation), and atmospheric refraction.
98		**
99		** 4) The context structure astrom produced by this function is used by
100		** eraAtciq* and eraAticq*.
101		**
102		** Called:
103		** eraApcs astrometry parameters, ICRS-GCRS, space observer
104		**
105		** Copyright (C) 2013-2020, NumFOCUS Foundation.
106		** Derived, with permission, from the SOFA library. See notes at end of file.
107		*/
108		{
109		/* Geocentric observer */
110	0	double pv[2][3] = { { 0.0, 0.0, 0.0 },
111		{ 0.0, 0.0, 0.0 } };
112
113
114		/* Compute the star-independent astrometry parameters. */
115	0	eraApcs(date1, date2, pv, ebpv, ehp, astrom);
116
117		/* Finished. */
118
119	0	}
120		/*----------------------------------------------------------------------
121		**
122		**
123		** Copyright (C) 2013-2020, NumFOCUS Foundation.
124		** All rights reserved.
125		**
126		** This library is derived, with permission, from the International
127		** Astronomical Union's "Standards of Fundamental Astronomy" library,
128		** available from http://www.iausofa.org.
129		**
130		** The ERFA version is intended to retain identical functionality to
131		** the SOFA library, but made distinct through different function and
132		** file names, as set out in the SOFA license conditions. The SOFA
133		** original has a role as a reference standard for the IAU and IERS,
134		** and consequently redistribution is permitted only in its unaltered
135		** state. The ERFA version is not subject to this restriction and
136		** therefore can be included in distributions which do not support the
137		** concept of "read only" software.
138		**
139		** Although the intent is to replicate the SOFA API (other than
140		** replacement of prefix names) and results (with the exception of
141		** bugs; any that are discovered will be fixed), SOFA is not
142		** responsible for any errors found in this version of the library.
143		**
144		** If you wish to acknowledge the SOFA heritage, please acknowledge
145		** that you are using a library derived from SOFA, rather than SOFA
146		** itself.
147		**
148		**
149		** TERMS AND CONDITIONS
150		**
151		** Redistribution and use in source and binary forms, with or without
152		** modification, are permitted provided that the following conditions
153		** are met:
154		**
155		** 1 Redistributions of source code must retain the above copyright
156		** notice, this list of conditions and the following disclaimer.
157		**
158		** 2 Redistributions in binary form must reproduce the above copyright
159		** notice, this list of conditions and the following disclaimer in
160		** the documentation and/or other materials provided with the
161		** distribution.
162		**
163		** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
164		** the International Astronomical Union nor the names of its
165		** contributors may be used to endorse or promote products derived
166		** from this software without specific prior written permission.
167		**
168		** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
169		** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
170		** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
171		** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
172		** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
173		** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
174		** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
175		** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
176		** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
177		** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
178		** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
179		** POSSIBILITY OF SUCH DAMAGE.
180		**
181		*/