Calculate Azimut

gistfile1.js

var calcAzimut = function (p1, p2) {
    'use strict';
    var toDeg = function (x) {
            return x * 180 / Math.PI;
        },
        dy = p2.latitude - p1.latitude,
        dx = p2.longitude - p1.longitude;

    return (
        (dx > 0) ? toDeg((Math.PI * 0.5) - Math.atan(dy / dx)) :
        (dx < 0) ? toDeg((Math.PI * 1.5) - Math.atan(dy / dx)) :
        (dy > 0) ? 0 :
        (dy < 0) ? Math.PI : undefined
    );
};

var calcAzimut=function(e,d){var c=function(f){return f*180/Math.PI},a=d.latitude-e.latitude,b=d.longitude-e.longitude;return((b>0)?c((Math.PI*0.5)-Math.atan(a/b)):(b<0)?c((Math.PI*1.5)-Math.atan(a/b)):(a>0)?0:(a<0)?Math.PI:undefined)};