/*!
 * satellite-js v5.0.0
 * (c) 2013 Shashwat Kandadai and UCSC
 * https://github.com/shashwatak/satellite-js
 * License: MIT
 */

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = dopplerFactor;
function dopplerFactor(location, position, velocity) {
  var mfactor = 7.292115E-5;
  var c = 299792.458; // Speed of light in km/s

  var range = {
    x: position.x - location.x,
    y: position.y - location.y,
    z: position.z - location.z
  };
  range.w = Math.sqrt(Math.pow(range.x, 2) + Math.pow(range.y, 2) + Math.pow(range.z, 2));
  var rangeVel = {
    x: velocity.x + mfactor * location.y,
    y: velocity.y - mfactor * location.x,
    z: velocity.z
  };
  function sign(value) {
    return value >= 0 ? 1 : -1;
  }
  var rangeRate = (range.x * rangeVel.x + range.y * rangeVel.y + range.z * rangeVel.z) / range.w;
  return 1 + rangeRate / c * sign(rangeRate);
}