Oct
06

The Spherical law of cosines gives a pretty accurate result that will be sufficient for most applications.
/** lat, longs are in radians */ public static double distance(double lat1, double lon1, double lat2, double lon2) { return R * Math.acos(Math.sin(lat1) * Math.sin(lat2) + Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon1  lon2)); } private static final double R = 6371.0; // earths mean radius in km
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