File Coverage

erfasrc/src/ee00b.c
Criterion Covered Total %
statement 0 6 0.0
branch n/a
condition n/a
subroutine n/a
pod n/a
total 0 6 0.0


line stmt bran cond sub pod time code
1             #include "erfa.h"
2              
3 0           double eraEe00b(double date1, double date2)
4             /*
5             ** - - - - - - - - -
6             ** e r a E e 0 0 b
7             ** - - - - - - - - -
8             **
9             ** Equation of the equinoxes, compatible with IAU 2000 resolutions but
10             ** using the truncated nutation model IAU 2000B.
11             **
12             ** Given:
13             ** date1,date2 double TT as a 2-part Julian Date (Note 1)
14             **
15             ** Returned (function value):
16             ** double equation of the equinoxes (Note 2)
17             **
18             ** Notes:
19             **
20             ** 1) The TT date date1+date2 is a Julian Date, apportioned in any
21             ** convenient way between the two arguments. For example,
22             ** JD(TT)=2450123.7 could be expressed in any of these ways,
23             ** among others:
24             **
25             ** date1 date2
26             **
27             ** 2450123.7 0.0 (JD method)
28             ** 2451545.0 -1421.3 (J2000 method)
29             ** 2400000.5 50123.2 (MJD method)
30             ** 2450123.5 0.2 (date & time method)
31             **
32             ** The JD method is the most natural and convenient to use in
33             ** cases where the loss of several decimal digits of resolution
34             ** is acceptable. The J2000 method is best matched to the way
35             ** the argument is handled internally and will deliver the
36             ** optimum resolution. The MJD method and the date & time methods
37             ** are both good compromises between resolution and convenience.
38             **
39             ** 2) The result, which is in radians, operates in the following sense:
40             **
41             ** Greenwich apparent ST = GMST + equation of the equinoxes
42             **
43             ** 3) The result is compatible with the IAU 2000 resolutions except
44             ** that accuracy has been compromised for the sake of speed. For
45             ** further details, see McCarthy & Luzum (2001), IERS Conventions
46             ** 2003 and Capitaine et al. (2003).
47             **
48             ** Called:
49             ** eraPr00 IAU 2000 precession adjustments
50             ** eraObl80 mean obliquity, IAU 1980
51             ** eraNut00b nutation, IAU 2000B
52             ** eraEe00 equation of the equinoxes, IAU 2000
53             **
54             ** References:
55             **
56             ** Capitaine, N., Wallace, P.T. and McCarthy, D.D., "Expressions to
57             ** implement the IAU 2000 definition of UT1", Astronomy &
58             ** Astrophysics, 406, 1135-1149 (2003)
59             **
60             ** McCarthy, D.D. & Luzum, B.J., "An abridged model of the
61             ** precession-nutation of the celestial pole", Celestial Mechanics &
62             ** Dynamical Astronomy, 85, 37-49 (2003)
63             **
64             ** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
65             ** IERS Technical Note No. 32, BKG (2004)
66             **
67             ** Copyright (C) 2013-2019, NumFOCUS Foundation.
68             ** Derived, with permission, from the SOFA library. See notes at end of file.
69             */
70             {
71             double dpsipr, depspr, epsa, dpsi, deps, ee;
72              
73              
74             /* IAU 2000 precession-rate adjustments. */
75 0           eraPr00(date1, date2, &dpsipr, &depspr);
76              
77             /* Mean obliquity, consistent with IAU 2000 precession-nutation. */
78 0           epsa = eraObl80(date1, date2) + depspr;
79              
80             /* Nutation in longitude. */
81 0           eraNut00b(date1, date2, &dpsi, &deps);
82              
83             /* Equation of the equinoxes. */
84 0           ee = eraEe00(date1, date2, epsa, dpsi);
85              
86 0           return ee;
87              
88             }
89             /*----------------------------------------------------------------------
90             **
91             **
92             ** Copyright (C) 2013-2019, NumFOCUS Foundation.
93             ** All rights reserved.
94             **
95             ** This library is derived, with permission, from the International
96             ** Astronomical Union's "Standards of Fundamental Astronomy" library,
97             ** available from http://www.iausofa.org.
98             **
99             ** The ERFA version is intended to retain identical functionality to
100             ** the SOFA library, but made distinct through different function and
101             ** file names, as set out in the SOFA license conditions. The SOFA
102             ** original has a role as a reference standard for the IAU and IERS,
103             ** and consequently redistribution is permitted only in its unaltered
104             ** state. The ERFA version is not subject to this restriction and
105             ** therefore can be included in distributions which do not support the
106             ** concept of "read only" software.
107             **
108             ** Although the intent is to replicate the SOFA API (other than
109             ** replacement of prefix names) and results (with the exception of
110             ** bugs; any that are discovered will be fixed), SOFA is not
111             ** responsible for any errors found in this version of the library.
112             **
113             ** If you wish to acknowledge the SOFA heritage, please acknowledge
114             ** that you are using a library derived from SOFA, rather than SOFA
115             ** itself.
116             **
117             **
118             ** TERMS AND CONDITIONS
119             **
120             ** Redistribution and use in source and binary forms, with or without
121             ** modification, are permitted provided that the following conditions
122             ** are met:
123             **
124             ** 1 Redistributions of source code must retain the above copyright
125             ** notice, this list of conditions and the following disclaimer.
126             **
127             ** 2 Redistributions in binary form must reproduce the above copyright
128             ** notice, this list of conditions and the following disclaimer in
129             ** the documentation and/or other materials provided with the
130             ** distribution.
131             **
132             ** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
133             ** the International Astronomical Union nor the names of its
134             ** contributors may be used to endorse or promote products derived
135             ** from this software without specific prior written permission.
136             **
137             ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
138             ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
139             ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
140             ** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
141             ** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
142             ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
143             ** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
144             ** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
145             ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
146             ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
147             ** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
148             ** POSSIBILITY OF SUCH DAMAGE.
149             **
150             */