A golden object found in southern Sweden 170 years ago is found, in fact, to be an ancient calendar. The golden object is ornamented with 12 sun-symbols and 12 moon-symbols; i.e. a combined picture of the annual movements of the Sun and the Moon through the sky. It is divided into 6 wedges by spoke structures. This is a representation of the Sumerian sexagesimal system. Similar images are present in rock-carvings in Sweden, and on a stone tablet from the ancient temple in Sippar in Mesopotamia. This gives evidence of a remarkably advanced knowledge in astronomy and a wide distribution of this knowledge from Mesopotamia all the way up to Scandinavia.