// Use this for initialization
 void Start()
 {
     obs = Observer.GetComponent <Relativity_Observer>();
     //coordinateTimeStart = obs.CoordinateTime;
     lr          = GetComponent <LineRenderer>();
     rb          = GetComponent <Relativity_Rigidbody>();
     rb.Observer = Observer;
 }
 // Use this for initialization
 void Start()
 {
     rb = GetComponent <Relativity_Rigidbody>();
     P0 = transform.position;
 }