Archive: The Measurement of Time
Summary
This episode explores the history of time measurement, tracing its evolution from ancient celestial observations to modern atomic clocks. Guests Kristen Lippincott, Jim Bennett, and Jonathan Betts discuss how early civilizations used the sun, moon, and stars, and how the Babylonians established the sexagesimal system that defines our hours and minutes. The conversation covers the development of water clocks, mechanical escapements, and the pivotal invention of the pendulum, which significantly improved accuracy for astronomical and navigational purposes. Finally, the panel examines the soci…
Topics discussed
Introduction and archive episode overview
Guests and the history of time measurement
Ancient tracking of sun, moon, and stars
Using landmasses and Stonehenge for time
Babylonian sexagesimal system and the number 60
Water clocks and their uses in courts
Sophisticated water clocks and early sundials
Sundial geometry and Renaissance astronomy
Early mechanical clocks in European monasteries
Salisbury Cathedral clock and semi-mechanical devices
Escapements, oscillators, and weight-driven accuracy
Incense clocks and interval measurement
Sponsor breaks for Fresh and Hershey's
Spring-driven clocks and mechanical advantage
Social implications of portable spring clocks
Clock dials and the origin of clockwise
Galileo, Huygens, and the pendulum
Astronomy, standards of length, and pendulums
London's Golden Age of clockmaking
The equation of time and solar vs clock time
Longitude, navigation, and trade driving accuracy
Local time, railways, and standardization
Greenwich Mean Time and the prime meridian
Quartz crystal clocks and piezoelectricity
Atomic clocks and microwave technology
Leap seconds and the debate on time standards
Outro and BBC Sounds promotion
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