The Nebroskydisk, which depicts an abstract representation of the sun, the moon and a constellation of stars, is a 3,600-year-old measuring device, believed to be from the Bronze Age with a very profound significance. It is the oldest known physical representation of astronomical phenomena in the world, and it also might be one of the earliest calendars ever conceived. The Skydisk is now part of UNESCO's Memory of the World Register, proving its great significance in the history of mankind, and adding that it is one of the most important archaeological finds of the 20th century. The accuracy of the angles between derising and setting points at both summer and winter solstices depicted in the disk reveals a great deal of study and knowledge, and suggests that the disk might have been used to determine when to crop and when to harvest.