On the northern summit plateau, the horizon observatory was built in 2008. The modern structure consists of a circular, flat surface of 88 m diameter, a lowered by 1.50 m forum with 35 m in diameter in the middle and two arches with a radius of about 45 m, which are like the great circles meridian and Himmelsäquator stretch across the square. The horizon observatory is intended to represent a modern version of prehistoric stone circles and structures such as Stonehenge. If the observer is located exactly in the lowered center of the structure, the plateau of the heap spreads out in all directions like an artificial horizon and with the help of some sightseeing marks the rising and setting of the sun can be observed on important calendar days like summer solstice, winter solstice or equinox , By means of further special bearing marks, lunar turns and the precession movement of the earth's axis can be observed by means of fixed star bearings. The spanning arcs divide the sky in the east and west halves as well as in the northern and southern hemisphere and therefore serve as sun calendars during the day and as a guide to the night sky with a self-illuminating scale. Idea and conception of this structure come from the Initiativkreis Horizontastronomie in the Ruhrgebiet e.V ..
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