An archaeologist studying a Celtic burial mound in Germany has discovered that it was not only a grave site, but a huge astronomical chronometer. The prince's grave at its center is part of a gigantic calendar. With the help of technology developed by NASA the researcher found that the arrangement of the other 130 graves in the tumulus correspond to the constellations in the northern night sky.
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The Celtic lunar calendar may be proof of the astronomical sophistication of a European culture long before the Roman era.