Now, while we may not be aware of it, each and every one of us is a slave to an unseen and unknowable master. It rules the sun and the earth, roving the cosmos with indifference - presiding over the birth and death of stars and galaxies and every living thing.It is Time. And, consequently, we have a long-standing obsession with measuring it. But just how far back does that obsession go?Chad Orzel, Associate Professor in the Department of Physics and Astronomy at Union College in Schenectady, NY, and author of ‘A Brief History of Timekeeping – The Science of Marking Time, from Stonehenge to Atomic Clocks’ joined Jonathan to discuss.Listen and subscribe to Futureproof with Jonathan McCrea on Apple Podcasts and Spotify.Download, listen and subscribe on the Newstalk App.You can also listen to Newstalk live on newstalk.com or on Alexa, by adding the Newstalk skill and asking: 'Alexa, play Newstalk'.