Capacitive sensor for determining an instantaneous angular position (α R ) of a rotatable element of a timepiece, the capacitive sensor comprising: - six stator electrodes formed as concentric arcs segments centered on the axis of rotation of the rotatable element, the first , third , fourth and sixth stator electrodes extending along 45°, and the second and fifth stator electrodes extending along 135°, the first and second , respectively the second and third , the fourth and fifth , and the fifth and sixth stator electrodes, extending along a common 45-degree angular portion, said four 45-degree angular portions being distinct, - one rotor electrode arranged to rotate with the rotatable element , the rotor electrode being made of two identical parts extending symmetrically on either side of its rotation axis along 90°, the rotor electrode and the stator electrodes being arranged to, during a rotation cycle of the rotatable element , provide capacitances (C 1 , C 2 , C 3 , C 4 ) between two of the six stator electrodes , such that each of the capacitances (C 1 , C 2 , C 3 , C 4 ) varies over at least a portion of the said rotation cycle due to the influence of said rotor electrode , the capacitances (C 1 , C 2 , C 3 , C 4 ) comprising a first differential capacitance pair comprising a first capacitance (C 1 ) formed between the first and second stator electrodes, and a second capacitance (C 2 ) formed between the second and third stator electrodes, the first capacitance (C 1 ) having an instantaneous first capacitance value X 1 and the second capacitance (C 2 ) having an instantaneous second capacitance value X 2 depending on the angular positioning of said rotor electrode , the capacitances (C 1 , C 2 , C 3 , C 4 ) comprising a second differential capacitance pair comprising a third capacitance (C 3 ) formed between the fourth and fifth stator electrodes, and a fourth capacitance (C 4 ) formed between the fifth and sixth stator electrodes, the third capacitance (C 3 ) having an instantaneous third capacitance value X 3 and the fourth capacitance (C 4 ) having an instantaneous fourth capacitance value X 4 depending on the angular positioning of said rotor electrode , the capacitive sensor comprising a sensor driver circuit for sensing capacitance values X 1 , X 2 , X 3 and X 4 , and for determining the instantaneous angular position (α R ) by evaluating a first differential capacitance value X 1-2 = X 1 - X 2 and a second differential capacitance value X 3-4 = X 3 - X 4 . - six stator electrodes formed as concentric arcs segments centered on the axis of rotation of the rotatable element, the first , third , fourth and sixth stator electrodes extending along 45°, and the second and fifth stator electrodes extending along 135°, the first and second , respectively the second and third , the fourth and fifth , and the fifth and sixth stator electrodes, extending along a common 45-degree angular portion, said four 45-degree angular portions being distinct, - one rotor electrode arranged to rotate with the rotatable element , the rotor electrode being made of two identical parts extending symmetrically on either side of its rotation axis along 90°, <EOS>