mfranz
dcb95d131b
- coplied license headers from h(xx) files to respective c(xx) files - removed trailing spaces - fixe $Id$ - fixed typos
51 lines
1.8 KiB
C++
51 lines
1.8 KiB
C++
// coremag.hxx -- compute local magnetic variation given position,
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// altitude, and date
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//
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// This is an implimentation of the NIMA WMM 2000
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//
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// http://www.nima.mil/GandG/ngdc-wmm2000.html
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//
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// Copyright (C) 2000 Edward A Williams <Ed_Williams@compuserve.com>
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//
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// Adapted from Excel 3.0 version 3/27/94 EAW
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// Recoded in C++ by Starry Chan
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// WMM95 added and rearranged in ANSI-C EAW 7/9/95
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// Put shell around program and made Borland & GCC compatible EAW 11/22/95
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// IGRF95 added 2/96 EAW
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// WMM2000 IGR2000 added 2/00 EAW
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// Released under GPL 3/26/00 EAW
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// Adaptions and modifications for the SimGear project 3/27/2000 CLO
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifndef SG_MAGVAR_HXX
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#define SG_MAGVAR_HXX
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/* Convert date to Julian day 1950-2049 */
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unsigned long int yymmdd_to_julian_days( int yy, int mm, int dd );
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/* return variation (in degrees) given geodetic latitude (radians), longitude
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(radians) ,height (km) and (Julian) date
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N and E lat and long are positive, S and W negative
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*/
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double calc_magvar( double lat, double lon, double h, long dat, double* field );
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#endif // SG_MAGVAR_HXX
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