| abstract |
The invention relates to a reference stem adapter having at least a first attachment element (8) for attaching the reference stem adapter to a body or instrument (7) and at least one second attachment element (5) to which marker (5a) can be attached, at least a bearing or hinge (6) is provided between the first fastening element and the second fastening element, at least one position detector being mounted on the at least one bearing or joint (6), and a method for recalibrating or re-referencing a body or instrument (7) with a reference star (5) attached to it, wherein the position of the reference star (5) is changed relative to the body or instrument (7), the change in position of the reference star (5) relative to the body or instrument (7) is detected. |