After the upper one has been placed so that the shadow or spot falls approximately on the horizon slit, the observer tilts the staff and moves the sighting index until the agreement is precise.
Emva kokuba ubekiwe umphezulu ukuze ithunzi okanye izikhanyisi ziwe kangange phezu kolundi lwesibane, umjongi uthambekisa isitafu ze lususe ulundi olubonakalayo de isigqibo sithathwe.