Abstract: The invention relates to a method and an apparatus for angle measurement or for the determination of an angle of position for an object. The method comprises the use of a beacon having a known position and rotating around its axis, which emits light or reflects light focused thereon. The light emitting from the beacon being determined either previously or for the start of each measurement for a given reference bearing. In the method, the light emitted from the beacon is picked up by a receiver present in an object to be measured, which is provided with elements for determining, by means of the light received from the beacon, the rotational speed of the beacon and further an angular position for the object with respect to said reference bearing.