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wcsmath.h
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/*============================================================================
WCSLIB 8.9 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2026, Mark Calabretta
This file is part of WCSLIB.
WCSLIB is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with WCSLIB. If not, see http://www.gnu.org/licenses.
Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
http://www.atnf.csiro.au/computing/software/wcs
$Id: wcsmath.h,v 8.9 2026/06/18 13:00:03 mcalabre Exp $
*=============================================================================
*
* WCSLIB 8.9 - C routines that implement the FITS World Coordinate System
* (WCS) standard. Refer to the README file provided with WCSLIB for an
* overview of the library.
*
*
* Summary of wcsmath.h
* --------------------
* Definition of mathematical constants used by WCSLIB.
*
*===========================================================================*/
#ifndef WCSLIB_WCSMATH
#define WCSLIB_WCSMATH
#ifdef PI
#undef PI
#endif
#ifdef D2R
#undef D2R
#endif
#ifdef R2D
#undef R2D
#endif
#ifdef SQRT2
#undef SQRT2
#endif
#ifdef SQRT2INV
#undef SQRT2INV
#endif
#define PI 3.141592653589793238462643
#define D2R (PI/180.0)
#define R2D (180.0/PI)
#define SQRT2 1.4142135623730950488
#define SQRT2INV (1.0/SQRT2)
#ifdef UNDEFINED
#undef UNDEFINED
#endif
#define UNDEFINED 987654321.0e99
#define undefined(value) (value == UNDEFINED)
#endif // WCSLIB_WCSMATH