Why Clocks Changed Everything About Human History

For almost all of human history, there was exactly one clock, and it hung in the sky. This video traces the real history of timekeeping: from sundials and water clocks, to the first mechanical clock built by monks in the 1270s, to the pendulum clock that made machines more accurate than the sun itself, to the railroads that forced entire countries onto one shared time, to the factory clock that finally reached into your own body. You'll learn why an "hour" used to stretch and shrink with the seasons, why the definition of a second no longer depends on the sun at all, and how time slowly stopped being something you read from the sky and became something someone else could own. Timestamps: 0:00 The Hook: Who Owns Your Time? 0:29 One Clock in the Sky 1:21 The Stretchy Hour 2:10 Sundials and Water Clocks 3:14 The Monks Build the First Clock 6:04 The Clock Walks into Town 6:58 Bells for Workers 7:37 The Pendulum Beats the Sun 9:11 The Sun Was Wrong 10:40 Clocks at Sea: Time Becomes Distance 11:30 The Train Forces One Time 12:18 America and the Day of Two Noons 13:04 The World Picks Greenwich 13:04 The Factory Puts the Clock in Your Body 14:26 The Sun Is Fired from the Second 15:14 The Recap: Nobody Stole It 16:00 Your Day Now, and the Ending #history #clock #timemanagement #education #explainer #timekeeping #industrialrevolution #philosophy