Nebra sky disc
The Nebra sky disc (, ) is a bronze disc of around diameter and a weight of , having a blue-green patina and inlaid with gold symbols. These symbols are interpreted generally as the Sun or full moon, a lunar crescent, and stars (including a cluster of seven stars, axiomatically interpreted as the Pleiades). Two golden arcs along the sides are thought to mark the angle between the solstices. Another arc at the bottom with internal parallel lines is usually interpreted as a solar boat with numerous oars, though some authors have also suggested that it may represent a rainbow, the Aurora Borealis, a comet, or a sickle. The disc was found buried on the Mittelberg hill near Nebra in Germany. It is dated by archaeologists to and attributed to the Early Bronze Age Unetice culture. Various scientific analyses of the disc, the items found with the disc, and the find spot have confirmed the Early Bronze Age dating. The Nebra sky disc features the oldest concrete depiction of astronomical phenomena known from anywhere in the world. In June 2013, it was included in the UNESCO Memory of the World Register and termed "one of the most important archaeological finds