Discovered in 1999 near Nebra, Germany and dated to roughly 1600 BCE, the Nebra Sky Disc is the oldest known concrete depiction of the cosmos: a bronze plate inlaid with gold symbols for the sun, a crescent moon, and a cluster of stars identified as the Pleiades. Its two gold arcs mark the sun's solstice positions with striking precision, and the pairing of the Pleiades with a young crescent moon appears to signal when an extra month should be added to keep the lunar and solar calendars in sync. Bronze Age farmers did not need new stars in the sky; they needed only to connect the ones already scattered above them into a pattern they could read and act on. UNESCO recognized the disc in 2013 as one of the most important archaeological finds of the twentieth century.