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authorWilliam Joye <wjoye@cfa.harvard.edu>2018-01-09 19:26:44 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2018-01-09 19:26:44 (GMT)
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update ast 8.6.2
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-#include "erfa.h"
-
-void eraApci(double date1, double date2,
- double ebpv[2][3], double ehp[3],
- double x, double y, double s,
- eraASTROM *astrom)
-/*
-** - - - - - - - -
-** e r a A p c i
-** - - - - - - - -
-**
-** For a terrestrial observer, prepare star-independent astrometry
-** parameters for transformations between ICRS and geocentric CIRS
-** coordinates. The Earth ephemeris and CIP/CIO are supplied by the
-** caller.
-**
-** The parameters produced by this function are required in the
-** parallax, light deflection, aberration, and bias-precession-nutation
-** parts of the astrometric transformation chain.
-**
-** Given:
-** date1 double TDB as a 2-part...
-** date2 double ...Julian Date (Note 1)
-** ebpv double[2][3] Earth barycentric position/velocity (au, au/day)
-** ehp double[3] Earth heliocentric position (au)
-** x,y double CIP X,Y (components of unit vector)
-** s double the CIO locator s (radians)
-**
-** Returned:
-** astrom eraASTROM* star-independent astrometry parameters:
-** pmt double PM time interval (SSB, Julian years)
-** eb double[3] SSB to observer (vector, au)
-** eh double[3] Sun to observer (unit vector)
-** em double distance from Sun to observer (au)
-** v double[3] barycentric observer velocity (vector, c)
-** bm1 double sqrt(1-|v|^2): reciprocal of Lorenz factor
-** bpn double[3][3] bias-precession-nutation matrix
-** along double unchanged
-** xpl double unchanged
-** ypl double unchanged
-** sphi double unchanged
-** cphi double unchanged
-** diurab double unchanged
-** eral double unchanged
-** refa double unchanged
-** refb double unchanged
-**
-** Notes:
-**
-** 1) The TDB date date1+date2 is a Julian Date, apportioned in any
-** convenient way between the two arguments. For example,
-** JD(TDB)=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. For most
-** applications of this function the choice will not be at all
-** critical.
-**
-** TT can be used instead of TDB without any significant impact on
-** accuracy.
-**
-** 2) All the vectors are with respect to BCRS axes.
-**
-** 3) In cases where the caller does not wish to provide the Earth
-** ephemeris and CIP/CIO, the function eraApci13 can be used instead
-** of the present function. This computes the required quantities
-** using other ERFA functions.
-**
-** 4) This is one of several functions that inserts into the astrom
-** structure star-independent parameters needed for the chain of
-** astrometric transformations ICRS <-> GCRS <-> CIRS <-> observed.
-**
-** The various functions support different classes of observer and
-** portions of the transformation chain:
-**
-** functions observer transformation
-**
-** eraApcg eraApcg13 geocentric ICRS <-> GCRS
-** eraApci eraApci13 terrestrial ICRS <-> CIRS
-** eraApco eraApco13 terrestrial ICRS <-> observed
-** eraApcs eraApcs13 space ICRS <-> GCRS
-** eraAper eraAper13 terrestrial update Earth rotation
-** eraApio eraApio13 terrestrial CIRS <-> observed
-**
-** Those with names ending in "13" use contemporary ERFA models to
-** compute the various ephemerides. The others accept ephemerides
-** supplied by the caller.
-**
-** The transformation from ICRS to GCRS covers space motion,
-** parallax, light deflection, and aberration. From GCRS to CIRS
-** comprises frame bias and precession-nutation. From CIRS to
-** observed takes account of Earth rotation, polar motion, diurnal
-** aberration and parallax (unless subsumed into the ICRS <-> GCRS
-** transformation), and atmospheric refraction.
-**
-** 5) The context structure astrom produced by this function is used by
-** eraAtciq* and eraAticq*.
-**
-** Called:
-** eraApcg astrometry parameters, ICRS-GCRS, geocenter
-** eraC2ixys celestial-to-intermediate matrix, given X,Y and s
-**
-** Copyright (C) 2013-2016, NumFOCUS Foundation.
-** Derived, with permission, from the SOFA library. See notes at end of file.
-*/
-{
-
-/* Star-independent astrometry parameters for geocenter. */
- eraApcg(date1, date2, ebpv, ehp, astrom);
-
-/* CIO based BPN matrix. */
- eraC2ixys(x, y, s, astrom->bpn);
-
-/* Finished. */
-
-}
-/*----------------------------------------------------------------------
-**
-**
-** 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.
-**
-*/