private void UpdateStartPosition()
 {
     startPoint = new Vector3d(shipRadius * Mathf.Cos(shipAngle),
                               shipRadius * Mathf.Sin(shipAngle),
                               0);
     startPoint = GravityScaler.ScaleVector3dPhyToScene(startPoint);
 }
 private void UpdateSoiPosition()
 {
     targetPoint = new Vector3d(soiRadius * Mathf.Cos(soiAngle) + moonRadius,
                                soiRadius * Mathf.Sin(soiAngle),
                                0);
     targetPoint = GravityScaler.ScaleVector3dPhyToScene(targetPoint);
 }