In 1999 a Bronze Age metal disc was found near the city of Nebra (Saxony-Anhalt/Germany), showing astronomical symbols and phenomena. Dated c. 1600 years BC, the so-called "Nebra sky disk" is regarded as the world’s oldest evidence of the astronomical skills of this period and allows us deep insight into the knowledge of the heavens possessed by our ancestors. Wilfried Hiller was inspired by this artefact to compose a work for mixed chorus.