Sensing of a rotational angle

A method for sensing a rotational angle of a rotatable shaft that is arranged rotatably around a rotation axis, wherein a magnetic field source is capable of being mechanically coupled to the rotatable shaft via a holder, wherein the magnetic field source provides a magnetization which is substantially parallel to the rotation axis and not rotationally symmetric to the rotation axis, wherein the magnetic field source has a mid-plane that is arranged perpendicular to the rotation axis, wherein a geometry of the magnetic field source shows mirror symmetry with regard to the mid-plane, wherein the magnet field source comprises or is a permanent magnet, the method comprising:

• detecting a magnetic field of the magnetic field source by at least two magnetic field sensor elements, wherein the at least two magnetic field sensor elements are located out of the rotatable shaft and are placed at a same radial distance from the rotation axis, wherein the holder is configured to mount the magnetic field source to the rotatable shaft to create an eccentricity that is based on a center of the magnetic field source being offset from a center of the rotatable shaft, and wherein the eccentricity is configured to cause a distance between each of the at least two magnetic field sensor elements and the permanent magnet to vary during a rotation of the rotatable shaft around the rotation axis.