This is the Nebra Sky Disc, dating from 1600-1800 BC, the oldest known visual representation of the universe from anywhere in the world. Found by illegal treasure hunters in East Germany in 1999, sold by them as soon as they dug it up, recovered by Swiss police in a raid in Basel in 2002…
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(I thought it looked familiar and looked at the pile of books currently occupying a corner of the couch. And there it was! on the cover of The World of Stonehenge, by Dunkin Garrow and Neil William!