https://www.popularmechanics.com/science/archaeology/a61806016/oldest-calendar-ever-turkey/ An ancient monument discovered in Turkey may just be an ancient monument. But, if its markings are what experts think they are, it might be the world’s oldest solar calendar. In a study published in Time and Mind based on the work of researchers from the University of Edinburgh, experts write that markings at Göbekli Tepe in southern Turkey, a temple-like archaeological complex filled with intricately carved symbols, indicate the makings of a solar calendar that tracks days, seasons, and years.
