diff options
Diffstat (limited to 'ast/erfa/s06a.c')
| -rw-r--r-- | ast/erfa/s06a.c | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/ast/erfa/s06a.c b/ast/erfa/s06a.c deleted file mode 100644 index 575c3dd..0000000 --- a/ast/erfa/s06a.c +++ /dev/null @@ -1,154 +0,0 @@ -#include "erfa.h" - -double eraS06a(double date1, double date2) -/* -** - - - - - - - - -** e r a S 0 6 a -** - - - - - - - - -** -** The CIO locator s, positioning the Celestial Intermediate Origin on -** the equator of the Celestial Intermediate Pole, using the IAU 2006 -** precession and IAU 2000A nutation models. -** -** Given: -** date1,date2 double TT as a 2-part Julian Date (Note 1) -** -** Returned (function value): -** double the CIO locator s in radians (Note 2) -** -** Notes: -** -** 1) The TT date date1+date2 is a Julian Date, apportioned in any -** convenient way between the two arguments. For example, -** JD(TT)=2450123.7 could be expressed in any of these ways, -** among others: -** -** date1 date2 -** -** 2450123.7 0.0 (JD method) -** 2451545.0 -1421.3 (J2000 method) -** 2400000.5 50123.2 (MJD method) -** 2450123.5 0.2 (date & time method) -** -** The JD method is the most natural and convenient to use in -** cases where the loss of several decimal digits of resolution -** is acceptable. The J2000 method is best matched to the way -** the argument is handled internally and will deliver the -** optimum resolution. The MJD method and the date & time methods -** are both good compromises between resolution and convenience. -** -** 2) The CIO locator s is the difference between the right ascensions -** of the same point in two systems. The two systems are the GCRS -** and the CIP,CIO, and the point is the ascending node of the -** CIP equator. The CIO locator s remains a small fraction of -** 1 arcsecond throughout 1900-2100. -** -** 3) The series used to compute s is in fact for s+XY/2, where X and Y -** are the x and y components of the CIP unit vector; this series is -** more compact than a direct series for s would be. The present -** function uses the full IAU 2000A nutation model when predicting -** the CIP position. -** -** Called: -** eraPnm06a classical NPB matrix, IAU 2006/2000A -** eraBpn2xy extract CIP X,Y coordinates from NPB matrix -** eraS06 the CIO locator s, given X,Y, IAU 2006 -** -** References: -** -** Capitaine, N., Chapront, J., Lambert, S. and Wallace, P., -** "Expressions for the Celestial Intermediate Pole and Celestial -** Ephemeris Origin consistent with the IAU 2000A precession- -** nutation model", Astron.Astrophys. 400, 1145-1154 (2003) -** -** n.b. The celestial ephemeris origin (CEO) was renamed "celestial -** intermediate origin" (CIO) by IAU 2006 Resolution 2. -** -** Capitaine, N. & Wallace, P.T., 2006, Astron.Astrophys. 450, 855 -** -** McCarthy, D. D., Petit, G. (eds.), 2004, IERS Conventions (2003), -** IERS Technical Note No. 32, BKG -** -** Wallace, P.T. & Capitaine, N., 2006, Astron.Astrophys. 459, 981 -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double rnpb[3][3], x, y, s; - - -/* Bias-precession-nutation-matrix, IAU 20006/2000A. */ - eraPnm06a(date1, date2, rnpb); - -/* Extract the CIP coordinates. */ - eraBpn2xy(rnpb, &x, &y); - -/* Compute the CIO locator s, given the CIP coordinates. */ - s = eraS06(date1, date2, x, y); - - return s; - -} -/*---------------------------------------------------------------------- -** -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** All rights reserved. -** -** This library is derived, with permission, from the International -** Astronomical Union's "Standards of Fundamental Astronomy" library, -** available from http://www.iausofa.org. -** -** The ERFA version is intended to retain identical functionality to -** the SOFA library, but made distinct through different function and -** file names, as set out in the SOFA license conditions. The SOFA -** original has a role as a reference standard for the IAU and IERS, -** and consequently redistribution is permitted only in its unaltered -** state. The ERFA version is not subject to this restriction and -** therefore can be included in distributions which do not support the -** concept of "read only" software. -** -** Although the intent is to replicate the SOFA API (other than -** replacement of prefix names) and results (with the exception of -** bugs; any that are discovered will be fixed), SOFA is not -** responsible for any errors found in this version of the library. -** -** If you wish to acknowledge the SOFA heritage, please acknowledge -** that you are using a library derived from SOFA, rather than SOFA -** itself. -** -** -** TERMS AND CONDITIONS -** -** Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions -** are met: -** -** 1 Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** -** 2 Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** -** 3 Neither the name of the Standards Of Fundamental Astronomy Board, -** the International Astronomical Union nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE -** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, -** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN -** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -** POSSIBILITY OF SUCH DAMAGE. -** -*/ |