code: function getPointRadius(point, trueAngle) {
  
      //If no altitude defined, will assume that point has no altitude
      if (point.alt == undefined) point.alt = 0;
  
      return point.alt + 1 / Math.sqrt(
          Math.pow(Math.cos(Deg2Rad(trueAngle)), 2) / majorAxisSquare +
          Math.pow(Math.sin(Deg2Rad(trueAngle)), 2) / minorAxisSquare
      );
  }
docs: Determine radius of small circle (radius between meridians)
  
  @param Object point Point on surface
  @param Number trueAngle True angle for point
  
  @var point {lat, lng, alt}
  @var lat - latitude (широта)
  @var lng - longitude (долгота)
  @var alt - altitude (высота над уровнем моря)
  
  @return Number