From sundials to mechanical clocks to atomic clocks, humans – throughout the centuries – have kept track of time using many different methods. Physics and astronomy professor Chad Orzel joins us this week to highlight just how much we rely on accurate clocks and how timekeeping technology has evolved across human history. Learn More: https://viewpointsradio.org/how-did-past-civilizations-keep-time Learn more about your ad choices. Visit megaphone.fm/adchoices