“Ages: following the big bang 13.8 billion years ago, time passed two-thirds of the way to the present before the formation of the Sun 4.57 billion years ago. Rescaled to a calendar year, starting with the big bang at 00:00:00 on 1 January, the Sun forms on 1 September, the Earth on 2 September, earliest signs of life appear on 13 September, earliest true mammals on 26 December, and humans just 2 hours before year’s end. For a year that starts with the earliest true mammals, the dinosaurs go extinct on 17 August, earliest primates appear on 9 September, and humans at dawn of 25 December. For a year that starts with the earliest humans, our own species appears on 19 November, the first built constructions on 8 December, and agricultural farming begins at midday on 29 December.–C. Patrick Doncaster, “Timeline of the human condition.” https://www.southampton.ac.uk/~cpd/history.html Accessed: January 5, 2022.