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Knowledge is lost
The knowledge of the intercalary rule was lost with the mounting of the two horizon arcs and the superimposition of two stars. The course of the sun over the course of a year was already known in the Stone Age and was implemented, for instance, in the form of “calendar structures”. Compared with the complex intercalary rule, the displacement of the function for depicting the course of the sun was rather a step backwards in the astronomical interpretation of the Sky Disc.
The length of the horizon arcs indicates that the Sky Disc was apparently not only laid down on the Mittelberg, but was also used. The horizon arcs form an angle of 82° only on the latitude of Central Germany. The arcs would be substantially longer at the polar circle and conversely compressed at the equator.
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