2 ms·Scientists Found a 12,000-Year-Old Monument May Be Humanity's Oldest Calendar1 points by teleforce 2y agognabgib 2y agoDiscussion (149 points, 5 days ago, 36 comments) https://news.ycombinator.com/item?id=41174979 https://news.ycombinator.com/item?id=41174979k4runa 2y agoAdam’s Calendar in South Africa is said to 75,000 years old and does the same thing