'Rotate the turtleshape to point in the specified direction
Argument: angle -- number
Rotate the turtleshape to point in the direction specified by angle,
regardless of its current tilt-angle. DO NOT change the turtle\'s
heading (direction of movement).
Examples (for a Turtle instance named turtle):
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.settiltangle(45)
>>> stamp()
>>> turtle.fd(50)
>>> turtle.settiltangle(-45)
>>> stamp()
>>> turtle.fd(50)'

def settiltangle(self, angle):

    tilt = (((- angle) * self._degreesPerAU) * self._angleOrient)
    tilt = (((tilt * math.pi) / 180.0) % (2 * math.pi))
    self.pen(resizemode='user', tilt=tilt)
