An example includes a sickle-shaped magnet arrangement, for use in determining a rotational angle of a rotatable object and is configured to co-rotate with the rotatable object around a rotational axis, includes an inner circumferential surface having an inner radius that is based on an azimuthal coordinate of the sickle-shaped magnet arrangement, an outer circumferential surface having an outer radius that is based on the azimuthal coordinate of the sickle-shaped magnet arrangement, wherein at least the inner radius or the outer radius varies based on the azimuthal coordinate; and an axial thickness between a first end of the sickle-shaped magnet arrangement and a second end of the sickle-shaped magnet arrangement, wherein the inner circumferential surface and the outer circumferential surface form a first sickle-shaped portion and a second sickle-shaped portion, wherein the first sickle-shaped portion is diametrically opposite the second sickle-shaped portion, and wherein the first sickle-shaped portion is magnetized in a first direction and the second sickle-shaped portion is magnetized in a second direction that is within a threshold angle of the first direction and different from the first direction.