On the main rock there is a 3-metre-high stone cross dating to 1877 and, since 1995, a semi-circular toposcope made of steel. This provides information about the direction and distance of those places and mountains that are visible over a radius of 18 km and also several more distant locations such as Karlsruhe and the Hornisgrinde as well as non-visible locations such as the Feldberg and Mont Blanc. It also gives the position of sunset on the visible horizon at the summer and winter solstices as well as at the equinoxes, with dates and times. In addition it gives the length of days (time between sunrise and sunset) in hours and minutes at the start of each season as well as the height of the midday sun (highest point of the sun during its visible trajectory) in degrees, also at the start of the seasons. In entirely other dimensions are given the average distance from the earth to the moon, the sun the orbit of the planet Pluto and the nearest star in km and light years as well as distances to the earth's interior.