Det er ny forskning i de gamle gravhøje, jættestuerne, der kraftigt peger på, at vi må have kendt til kompliceret geometri allerede for 5500 år siden.
Indgangen til gravhøjene er nemlig placeret sådan, at de sigter direkte mod det punkt i horisonten, hvor en fuldmåneopgang hvert tredje til fjerde år efterfølges af en måneformørkelse.
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