/**************************************************************************
 * constants.h -- various constant definitions
 *
 * Written by Curtis Olson, started July 1997.
 *
 * Copyright (C) 1997  Curtis L. Olson  - curt@infoplane.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 * (Log is kept at end of this file)
 **************************************************************************/


#ifndef CONSTANTS_H
#define CONSTANTS_H


/* Radius of Earth in meters at the equator.  Another source had
 * 6378165 but this is probably close enough */
#define EARTH_RAD 6378.155


/* Degrees to Radians */
#define DEG_TO_RAD       0.017453292

/* Radians to Degrees */
#define RAD_TO_DEG       57.29577951

/* Arc seconds to radians */
#define ARCSEC_TO_RAD 4.84813681109535993589e-06

/* Feet to Meters */
#define FEET_TO_METER    0.3048

/* Meters to Feet */
#define METER_TO_FEET    3.28083989501312335958  


/* For divide by zero avoidance, this will be close enough to zero */
#define EPSILON 0.000001


#endif CONSTANTS_H


/* $Log$
/* Revision 1.3  1997/07/14 16:26:03  curt
/* Testing/playing -- placed objects randomly across the entire terrain.
/*
 * Revision 1.2  1997/07/08 18:20:11  curt
 * Working on establishing a hard ground.
 *
 * Revision 1.1  1997/07/07 21:02:36  curt
 * Initial revision.
 * */