The Nebra Sky Disc is attributed to a site near Nebra, Saxony-Anhalt in Germany and dated to c.1600 BC. As such it is the oldest depiction of the cosmos in the world and has been associated with the Bronze Age Unetice Culture. Showing the moon, sun, and several other celestial constellations, the disc soon proved to be not only a simple depiction of the visible sky but a sophisticated tool to anticipate moon phases and calendar planning in the bronze age.
The Seven Sisters, aka the Pleiades is depicted with seven rather than six stars which adds credence to the speculation that the “Seven Sisters” was so named as a 7th star had once been more visible from earth in antiquity.