How The Moon Taught Humans To Count Time

Summary

In this episode of Crash Course Astronomy, Phil takes you through the cause and name of the Tonight, look up at the sky, and you'll see something your ancestors tracked more closely than almost anything else in their world. Take off your watch. Throw out your phone. Every clock in the house is gone. It's just you, the sky, and the seasons — and your ... Thirty thousand years ago, somebody sat down with a flat piece of bone and started making marks on it. Sixty-nine of them. Long before writing, before agriculture, before the pyramids, someone was already carving notches into bone to keep track of Timekeeping A lot goes on in just 24 hours. But why is a day divided in 24 hours in the first place? Before writing. Before farming. Before a single city existed — someone in a cave was already Ancient Sumerian civilization left behind thousands of cuneiform tablets containing some of the earliest known written ... How the Ancient Greeks measured the size and distance of the Sun and