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<html>
<head>
<meta charset="utf-8">
<title>Namnlöst dokument</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
start_latitude = 59.323032
start_longitude = 18.055172
stop_latitude = 59.324542
stop_longitude = 18.051739
var y = Math.sin(stop_longitude-start_longitude) * Math.cos(stop_latitude);
var x = Math.cos(start_latitude)*Math.sin(stop_latitude) -
Math.sin(start_latitude)*Math.cos(stop_latitude) * Math.cos(stop_longitude-start_longitude);
var brng = Math.atan2(y, x) * 180 / Math.PI;
alert("Bearing in degreee: " + brng);
</script>
</head>
const y = Math.sin(λ2-λ1) * Math.cos(φ2);
const x = Math.cos(φ1)*Math.sin(φ2) -
Math.sin(φ1)*Math.cos(φ2)*Math.cos(λ2-λ1);
const θ = Math.atan2(y, x);
const brng = (θ*180/Math.PI + 360) % 360; // in degrees
<body>
</body>
</html>