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authorWilliam Joye <wjoye@cfa.harvard.edu>2018-09-21 17:02:41 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2018-09-21 17:02:41 (GMT)
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update ast
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-#include "erfa.h"
-
-double eraPap(double a[3], double b[3])
-/*
-** - - - - - - -
-** e r a P a p
-** - - - - - - -
-**
-** Position-angle from two p-vectors.
-**
-** Given:
-** a double[3] direction of reference point
-** b double[3] direction of point whose PA is required
-**
-** Returned (function value):
-** double position angle of b with respect to a (radians)
-**
-** Notes:
-**
-** 1) The result is the position angle, in radians, of direction b with
-** respect to direction a. It is in the range -pi to +pi. The
-** sense is such that if b is a small distance "north" of a the
-** position angle is approximately zero, and if b is a small
-** distance "east" of a the position angle is approximately +pi/2.
-**
-** 2) The vectors a and b need not be of unit length.
-**
-** 3) Zero is returned if the two directions are the same or if either
-** vector is null.
-**
-** 4) If vector a is at a pole, the result is ill-defined.
-**
-** Called:
-** eraPn decompose p-vector into modulus and direction
-** eraPm modulus of p-vector
-** eraPxp vector product of two p-vectors
-** eraPmp p-vector minus p-vector
-** eraPdp scalar product of two p-vectors
-**
-** Copyright (C) 2013-2016, NumFOCUS Foundation.
-** Derived, with permission, from the SOFA library. See notes at end of file.
-*/
-{
- double am, au[3], bm, st, ct, xa, ya, za, eta[3], xi[3], a2b[3], pa;
-
-
-/* Modulus and direction of the a vector. */
- eraPn(a, &am, au);
-
-/* Modulus of the b vector. */
- bm = eraPm(b);
-
-/* Deal with the case of a null vector. */
- if ((am == 0.0) || (bm == 0.0)) {
- st = 0.0;
- ct = 1.0;
- } else {
-
- /* The "north" axis tangential from a (arbitrary length). */
- xa = a[0];
- ya = a[1];
- za = a[2];
- eta[0] = -xa * za;
- eta[1] = -ya * za;
- eta[2] = xa*xa + ya*ya;
-
- /* The "east" axis tangential from a (same length). */
- eraPxp(eta, au, xi);
-
- /* The vector from a to b. */
- eraPmp(b, a, a2b);
-
- /* Resolve into components along the north and east axes. */
- st = eraPdp(a2b, xi);
- ct = eraPdp(a2b, eta);
-
- /* Deal with degenerate cases. */
- if ((st == 0.0) && (ct == 0.0)) ct = 1.0;
- }
-
-/* Position angle. */
- pa = atan2(st, ct);
-
- return pa;
-
-}
-/*----------------------------------------------------------------------
-**
-**
-** 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.
-**
-*/