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authorWilliam Joye <wjoye@cfa.harvard.edu>2017-12-08 18:57:06 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2017-12-08 18:57:06 (GMT)
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-#include "erfa.h"
-
-void eraFk5hz(double r5, double d5, double date1, double date2,
- double *rh, double *dh)
-/*
-** - - - - - - - - -
-** e r a F k 5 h z
-** - - - - - - - - -
-**
-** Transform an FK5 (J2000.0) star position into the system of the
-** Hipparcos catalogue, assuming zero Hipparcos proper motion.
-**
-** Given:
-** r5 double FK5 RA (radians), equinox J2000.0, at date
-** d5 double FK5 Dec (radians), equinox J2000.0, at date
-** date1,date2 double TDB date (Notes 1,2)
-**
-** Returned:
-** rh double Hipparcos RA (radians)
-** dh double Hipparcos Dec (radians)
-**
-** Notes:
-**
-** 1) This function converts a star position from the FK5 system to
-** the Hipparcos system, in such a way that the Hipparcos proper
-** motion is zero. Because such a star has, in general, a non-zero
-** proper motion in the FK5 system, the function requires the date
-** at which the position in the FK5 system was determined.
-**
-** 2) 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.
-**
-** 3) The FK5 to Hipparcos transformation is modeled as a pure
-** rotation and spin; zonal errors in the FK5 catalogue are not
-** taken into account.
-**
-** 4) The position returned by this function is in the Hipparcos
-** reference system but at date date1+date2.
-**
-** 5) See also eraFk52h, eraH2fk5, eraHfk5z.
-**
-** Called:
-** eraS2c spherical coordinates to unit vector
-** eraFk5hip FK5 to Hipparcos rotation and spin
-** eraSxp multiply p-vector by scalar
-** eraRv2m r-vector to r-matrix
-** eraTrxp product of transpose of r-matrix and p-vector
-** eraPxp vector product of two p-vectors
-** eraC2s p-vector to spherical
-** eraAnp normalize angle into range 0 to 2pi
-**
-** Reference:
-**
-** F.Mignard & M.Froeschle, 2000, Astron.Astrophys. 354, 732-739.
-**
-** Copyright (C) 2013-2016, NumFOCUS Foundation.
-** Derived, with permission, from the SOFA library. See notes at end of file.
-*/
-{
- double t, p5e[3], r5h[3][3], s5h[3], vst[3], rst[3][3], p5[3],
- ph[3], w;
-
-
-/* Interval from given date to fundamental epoch J2000.0 (JY). */
- t = - ((date1 - ERFA_DJ00) + date2) / ERFA_DJY;
-
-/* FK5 barycentric position vector. */
- eraS2c(r5, d5, p5e);
-
-/* FK5 to Hipparcos orientation matrix and spin vector. */
- eraFk5hip(r5h, s5h);
-
-/* Accumulated Hipparcos wrt FK5 spin over that interval. */
- eraSxp(t, s5h, vst);
-
-/* Express the accumulated spin as a rotation matrix. */
- eraRv2m(vst, rst);
-
-/* Derotate the vector's FK5 axes back to date. */
- eraTrxp(rst, p5e, p5);
-
-/* Rotate the vector into the Hipparcos system. */
- eraRxp(r5h, p5, ph);
-
-/* Hipparcos vector to spherical. */
- eraC2s(ph, &w, dh);
- *rh = eraAnp(w);
-
- return;
-
-}
-/*----------------------------------------------------------------------
-**
-**
-** 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.
-**
-*/