Built by artist Joseph von Utzschner in the first half of the 19th century, this instrument is an observational astronomical device used to determine the height of celestial bodies above the horizon. It consists of a frame limited by two radii, an arc with a scale, an observation telescope, and a mirror system. It is used to determine the position of celestial bodies by using a mirror system that produces a reflection image of the observed object parallel to the horizon in the observer's field of view. In order to observe the position of the sun, a filter is used to limit the amount of light reaching the observer's eyes. The instrument is currently housed in the Jagiellonian University Museum in Munich, Germany.