Angle and torque measuring device

The invention relates to an apparatus and a method for the determination of a highly accurate absolute rotational angle Xt of the rotational position of a rotatably mounted steering shaft (300), wherein the rotation of a rotor of an electric motor (2) in the rotation of the steering shaft with a gear (6, 40) having a gear ratio factor K for power assist in the rotation of the steering shaft (300) is coupled, wherein the rotational position of the rotation of the rotor with a rotor position sensor (7) is measured in the method and using the number of performed revolutions of the rotor, this value directly to determining the highly accurate Xt absolute rotational angle of the steering shaft (300) is used. In calibration, the output values ​​from which carried out the counting of the revolutions or the calculations are determined.