Turtle animation of the "8"

The JavaScript code

    var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox: [-250, 250, 250, -250]});
    var t = brd.create('turtle',[0, 0], {strokeOpacity:0.5});
    t.setPenSize(3);
    t.right(90);
    var alpha = 0;
 
    var run = function() {
       t.fd(2);
       if (Math.floor(alpha / 360) % 2 === 0) {
          t.left(1);
       } else {
          t.right(1);
       }

       alpha += 1;
       
       if (alpha < 1440) {
           setTimeout(run,25);
       }
    }

    run();