source: branches/FACT++_part_filenames/erfa/src/aper13.c@ 20051

Last change on this file since 20051 was 18711, checked in by tbretz, 8 years ago
Updated to ERFA 1.3.0 (no relevant code change except the leap second at the beginning of 2017)
File size: 7.6 KB
Line 
1#include "erfa.h"
2
3void eraAper13(double ut11, double ut12, eraASTROM *astrom)
4/*
5** - - - - - - - - - -
6** e r a A p e r 1 3
7** - - - - - - - - - -
8**
9** In the star-independent astrometry parameters, update only the
10** Earth rotation angle. The caller provides UT1, (n.b. not UTC).
11**
12** Given:
13** ut11 double UT1 as a 2-part...
14** ut12 double ...Julian Date (Note 1)
15** astrom eraASTROM* star-independent astrometry parameters:
16** pmt double not used
17** eb double[3] not used
18** eh double[3] not used
19** em double not used
20** v double[3] not used
21** bm1 double not used
22** bpn double[3][3] not used
23** along double longitude + s' (radians)
24** xpl double not used
25** ypl double not used
26** sphi double not used
27** cphi double not used
28** diurab double not used
29** eral double not used
30** refa double not used
31** refb double not used
32**
33** Returned:
34** astrom eraASTROM* star-independent astrometry parameters:
35** pmt double unchanged
36** eb double[3] unchanged
37** eh double[3] unchanged
38** em double unchanged
39** v double[3] unchanged
40** bm1 double unchanged
41** bpn double[3][3] unchanged
42** along double unchanged
43** xpl double unchanged
44** ypl double unchanged
45** sphi double unchanged
46** cphi double unchanged
47** diurab double unchanged
48** eral double "local" Earth rotation angle (radians)
49** refa double unchanged
50** refb double unchanged
51**
52** Notes:
53**
54** 1) The UT1 date (n.b. not UTC) ut11+ut12 is a Julian Date,
55** apportioned in any convenient way between the arguments ut11 and
56** ut12. For example, JD(UT1)=2450123.7 could be expressed in any
57** of these ways, among others:
58**
59** ut11 ut12
60**
61** 2450123.7 0.0 (JD method)
62** 2451545.0 -1421.3 (J2000 method)
63** 2400000.5 50123.2 (MJD method)
64** 2450123.5 0.2 (date & time method)
65**
66** The JD method is the most natural and convenient to use in cases
67** where the loss of several decimal digits of resolution is
68** acceptable. The J2000 and MJD methods are good compromises
69** between resolution and convenience. The date & time method is
70** best matched to the algorithm used: maximum precision is
71** delivered when the ut11 argument is for 0hrs UT1 on the day in
72** question and the ut12 argument lies in the range 0 to 1, or vice
73** versa.
74**
75** 2) If the caller wishes to provide the Earth rotation angle itself,
76** the function eraAper can be used instead. One use of this
77** technique is to substitute Greenwich apparent sidereal time and
78** thereby to support equinox based transformations directly.
79**
80** 3) This is one of several functions that inserts into the astrom
81** structure star-independent parameters needed for the chain of
82** astrometric transformations ICRS <-> GCRS <-> CIRS <-> observed.
83**
84** The various functions support different classes of observer and
85** portions of the transformation chain:
86**
87** functions observer transformation
88**
89** eraApcg eraApcg13 geocentric ICRS <-> GCRS
90** eraApci eraApci13 terrestrial ICRS <-> CIRS
91** eraApco eraApco13 terrestrial ICRS <-> observed
92** eraApcs eraApcs13 space ICRS <-> GCRS
93** eraAper eraAper13 terrestrial update Earth rotation
94** eraApio eraApio13 terrestrial CIRS <-> observed
95**
96** Those with names ending in "13" use contemporary ERFA models to
97** compute the various ephemerides. The others accept ephemerides
98** supplied by the caller.
99**
100** The transformation from ICRS to GCRS covers space motion,
101** parallax, light deflection, and aberration. From GCRS to CIRS
102** comprises frame bias and precession-nutation. From CIRS to
103** observed takes account of Earth rotation, polar motion, diurnal
104** aberration and parallax (unless subsumed into the ICRS <-> GCRS
105** transformation), and atmospheric refraction.
106**
107** Called:
108** eraAper astrometry parameters: update ERA
109** eraEra00 Earth rotation angle, IAU 2000
110**
111** Copyright (C) 2013-2016, NumFOCUS Foundation.
112** Derived, with permission, from the SOFA library. See notes at end of file.
113*/
114{
115 eraAper(eraEra00(ut11,ut12), astrom);
116
117/* Finished. */
118
119}
120/*----------------------------------------------------------------------
121**
122**
123** Copyright (C) 2013-2016, 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*/
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