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authorWilliam Joye <wjoye@cfa.harvard.edu>2018-01-09 19:06:17 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2018-01-09 19:06:17 (GMT)
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update ast 8.6.2
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-#include "erfa.h"
-
-void eraPr00(double date1, double date2, double *dpsipr, double *depspr)
-/*
-** - - - - - - - -
-** e r a P r 0 0
-** - - - - - - - -
-**
-** Precession-rate part of the IAU 2000 precession-nutation models
-** (part of MHB2000).
-**
-** Given:
-** date1,date2 double TT as a 2-part Julian Date (Note 1)
-**
-** Returned:
-** dpsipr,depspr double precession corrections (Notes 2,3)
-**
-** 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 precession adjustments are expressed as "nutation
-** components", corrections in longitude and obliquity with respect
-** to the J2000.0 equinox and ecliptic.
-**
-** 3) Although the precession adjustments are stated to be with respect
-** to Lieske et al. (1977), the MHB2000 model does not specify which
-** set of Euler angles are to be used and how the adjustments are to
-** be applied. The most literal and straightforward procedure is to
-** adopt the 4-rotation epsilon_0, psi_A, omega_A, xi_A option, and
-** to add dpsipr to psi_A and depspr to both omega_A and eps_A.
-**
-** 4) This is an implementation of one aspect of the IAU 2000A nutation
-** model, formally adopted by the IAU General Assembly in 2000,
-** namely MHB2000 (Mathews et al. 2002).
-**
-** References:
-**
-** Lieske, J.H., Lederle, T., Fricke, W. & Morando, B., "Expressions
-** for the precession quantities based upon the IAU (1976) System of
-** Astronomical Constants", Astron.Astrophys., 58, 1-16 (1977)
-**
-** Mathews, P.M., Herring, T.A., Buffet, B.A., "Modeling of nutation
-** and precession New nutation series for nonrigid Earth and
-** insights into the Earth's interior", J.Geophys.Res., 107, B4,
-** 2002. The MHB2000 code itself was obtained on 9th September 2002
-** from ftp://maia.usno.navy.mil/conv2000/chapter5/IAU2000A.
-**
-** Wallace, P.T., "Software for Implementing the IAU 2000
-** Resolutions", in IERS Workshop 5.1 (2002).
-**
-** Copyright (C) 2013-2016, NumFOCUS Foundation.
-** Derived, with permission, from the SOFA library. See notes at end of file.
-*/
-{
- double t;
-
-/* Precession and obliquity corrections (radians per century) */
- static const double PRECOR = -0.29965 * ERFA_DAS2R,
- OBLCOR = -0.02524 * ERFA_DAS2R;
-
-
-/* Interval between fundamental epoch J2000.0 and given date (JC). */
- t = ((date1 - ERFA_DJ00) + date2) / ERFA_DJC;
-
-/* Precession rate contributions with respect to IAU 1976/80. */
- *dpsipr = PRECOR * t;
- *depspr = OBLCOR * t;
-
- 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.
-**
-*/