Oldest representation of the heavens

In 1990, two treasure hunters, wandering on Mittelberg Hill, near Nebra, Germany, discovered a mysterious disc. Buried about 3,500 years ago, the disc was an archaeological sensation. With just a 15 cm radius, this ordinary-looking artifact nevertheless seemed to contain important astronomical knowledge as well as hidden religious significance.

 This is interesting. I was somewhat surprised as I thought other representations had been found. This is roughly 1500 BC. This is about the time that Mycenaeans were beginning to bang around

and the Olmec getting ready to make some heads.