FACT++  1.0
pmat00.c
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1 #include "erfa.h"
2 
3 void eraPmat00(double date1, double date2, double rbp[3][3])
4 /*
5 ** - - - - - - - - - -
6 ** e r a P m a t 0 0
7 ** - - - - - - - - - -
8 **
9 ** Precession matrix (including frame bias) from GCRS to a specified
10 ** date, IAU 2000 model.
11 **
12 ** Given:
13 ** date1,date2 double TT as a 2-part Julian Date (Note 1)
14 **
15 ** Returned:
16 ** rbp double[3][3] bias-precession matrix (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 matrix operates in the sense V(date) = rbp * V(GCRS), where
40 ** the p-vector V(GCRS) is with respect to the Geocentric Celestial
41 ** Reference System (IAU, 2000) and the p-vector V(date) is with
42 ** respect to the mean equatorial triad of the given date.
43 **
44 ** Called:
45 ** eraBp00 frame bias and precession matrices, IAU 2000
46 **
47 ** Reference:
48 **
49 ** IAU: Trans. International Astronomical Union, Vol. XXIVB; Proc.
50 ** 24th General Assembly, Manchester, UK. Resolutions B1.3, B1.6.
51 ** (2000)
52 **
53 ** Copyright (C) 2013-2015, NumFOCUS Foundation.
54 ** Derived, with permission, from the SOFA library. See notes at end of file.
55 */
56 {
57  double rb[3][3], rp[3][3];
58 
59 /* Obtain the required matrix (discarding others). */
60  eraBp00(date1, date2, rb, rp, rbp);
61 
62  return;
63 
64 }
65 /*----------------------------------------------------------------------
66 **
67 **
68 ** Copyright (C) 2013-2015, NumFOCUS Foundation.
69 ** All rights reserved.
70 **
71 ** This library is derived, with permission, from the International
72 ** Astronomical Union's "Standards of Fundamental Astronomy" library,
73 ** available from http://www.iausofa.org.
74 **
75 ** The ERFA version is intended to retain identical functionality to
76 ** the SOFA library, but made distinct through different function and
77 ** file names, as set out in the SOFA license conditions. The SOFA
78 ** original has a role as a reference standard for the IAU and IERS,
79 ** and consequently redistribution is permitted only in its unaltered
80 ** state. The ERFA version is not subject to this restriction and
81 ** therefore can be included in distributions which do not support the
82 ** concept of "read only" software.
83 **
84 ** Although the intent is to replicate the SOFA API (other than
85 ** replacement of prefix names) and results (with the exception of
86 ** bugs; any that are discovered will be fixed), SOFA is not
87 ** responsible for any errors found in this version of the library.
88 **
89 ** If you wish to acknowledge the SOFA heritage, please acknowledge
90 ** that you are using a library derived from SOFA, rather than SOFA
91 ** itself.
92 **
93 **
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95 **
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97 ** modification, are permitted provided that the following conditions
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126 */
void eraPmat00(double date1, double date2, double rbp[3][3])
Definition: pmat00.c:3
void eraBp00(double date1, double date2, double rb[3][3], double rp[3][3], double rbp[3][3])
Definition: bp00.c:3