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.

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