The Nebra Sky disk is one of the most enigmatic artifacts of the Bronze Age. At just over a foot in diameter, and weighing 2kg, the bronze disk is embossed with thirty-two small gold circles, a large circular gold plate, and two crescents.
As with most artifacts that have no written descriptions from the time if their creation, we have to guess at the meaning of the symbols on the Nebra disk. However, there are some strong clues. The grouping of seven small dots roughly correspond to the Pleiades star cluster, a common landmark in the winter night sky in the Northern Hemisphere. With the astronomical theme established, the disk and wide crescent may be the sun and moon, or full and eclipsed views of either.
The Nebra disk was discovered near Nebra, Saxony-Anhalt, in Germany with two bronze swords, two hatchets, a chisel, and fragments of spiral bracelets. The bronze swords were dated to between 1600 and 1560 BCE, and so by association, the Nebra Sky disk is considered to be the oldest known depiction of the cosmos.
Reed Enger, "Nebra Sky Disk," in Obelisk Art History, Published August 12, 2018; last modified January 22, 2019, http://arthistoryproject.com/timeline/prehistory/bronze-age/nebra-sky-disk/.