Nodejs Utililty Methods Distance Calculate

function calculateDistance(lat2, lon2) {
  var R = 3959; 
  var lat1 = 47.3193057;
  var lon1 = -93.2895824;
  var dLat = (lat2 - lat1).toRad();
  var dLon = (lon2 - lon1).toRad(); 
  var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
          Math.cos(lat1.toRad()) * Math.cos(lat2.toRad()) * 
          Math.sin(dLon / 2) * Math.sin(dLon / 2); 
...

exports.distance = function(lat1, lon1, lat2, lon2) {
  var radlat1 = Math.PI * lat1/180;
  var radlat2 = Math.PI * lat2/180;
  var radlon1 = Math.PI * lon1/180;
  var radlon2 = Math.PI * lon2/180;
  var theta = lon1-lon2;
  var radtheta = Math.PI * theta/180;
  var dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
  dist = Math.acos(dist);
...

function distance(lat1, lon1, lat2, lon2) {
  var R = 6371;
  var a = 0.5 - Math.cos((lat2 - lat1) * Math.PI / 180)/2 + 
     Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) * 
     (1 - Math.cos((lon2 - lon1) * Math.PI / 180))/2;
  var m = R * 2 * Math.asin(Math.sqrt(a))*1000;
  return Math.floor(m);

function distance(lat1,lon1,lat2,lon2) {
  var R = 6371; 
  var dLat = deg2rad(lat2-lat1);  
  var dLon = deg2rad(lon2-lon1);
  var a =
    Math.sin(dLat/2) * Math.sin(dLat/2) +
    Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) *
    Math.sin(dLon/2) * Math.sin(dLon/2)
    ;
...

function Point(x, y) {
    this.x = x;
    this.y = y;
function randomPoint() {
    var randomx = randomNumber(WIDTH);
    var randomy = randomNumber(HEIGHT);
    var randomPoint = new Point(randomx, randomy);
    return randomPoint;
...

Math.distance = function(x1, x2, y1, y2){
  var x = x2 - x1;
  var y = y2 - y1;
  return Math.sqrt(x * x + y * y);
};

Util.distanceBetweenTwoPoints = function(p1, p2) {
  return Math.sqrt(Math.pow(p2.y - p1.y, 2) + Math.pow(p2.x - p1.x, 2)).toFixed(2);
};

window.distanceOfTimeInWords = function (from, to) {
  var distance_in_milliseconds = to - from;
  var distance_in_minutes = Math.round(Math.abs(distance_in_milliseconds / 60000));
  var words = "";
  if (distance_in_minutes == 0) {
    words = "less than a minute";
  } else if (distance_in_minutes == 1) {
    words = "1 minute";
  } else if (distance_in_minutes < 45) {
...

function getEditDistance(a, b){
  if(a.length == 0) return b.length;
  if(b.length == 0) return a.length;
  var matrix = [];
  var i;
  for(i = 0; i <= b.length; i++){
    matrix[i] = [i];
  var j;
...

function get_distance (lat1, lon1, lat2, lon2) {
  var R = 6371;
  var dLat = deg2rad(lat2-lat1);
  var dLon = deg2rad(lon2-lon1);
  var lat1 = deg2rad(lat1);
  var lat2 = deg2rad(lat2);
  var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
          Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
...