EN
var EARTH_RADIUS = 6372795;
lat1 = latA * Math.PI / 180;
lat2 = latB * Math.PI / 180;
long1 = longA * Math.PI / 180;
long2 = longB * Math.PI / 180;
cl1 = Math.cos(lat1);
cl2 = Math.cos(lat2);
sl1 = Math.sin(lat1);
sl2 = Math.sin(lat2);
delta = long2 - long1;
cdelta = Math.cos(delta);
sdelta = Math.sin(delta);
y = Math.sqrt(Math.pow(cl2 * sdelta, 2) + Math.pow(cl1 * sl2 - sl1 * cl2 * cdelta, 2));
x = sl1 * sl2 + cl1 * cl2 * cdelta;
ad = Math.atan2(y, x);
dist = Math.ceil(ad * EARTH_RADIUS);
return dist;
}




