var speed = 0.001;
var originX = 0.0;
var originY = 0.0;
var altitude = 4.0;
var angle : float = 0.0;
var angledeg : float = 0.0;
function Update () {
    var relativeX = Mathf.Cos(angle) * altitude;
    var relativeY = Mathf.Sin(angle) * altitude;
    angle = (angle + speed * Time.deltaTime) % (2.0 * Mathf.PI);
    angle = angle % (2 * Mathf.PI);
    angledeg = (angle * Mathf.Rad2Deg);
    angledeg = angledeg % 360;
    transform.localPosition = Vector3(relativeX + originX,0,relativeY + originY);
    transform.localEulerAngles = Vector3(0,90 - angledeg,0);
}