Into the Impossible With Brian Keating Does Time Really Exist and How Can We Measure It w/ Chad Orzel (#406)
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Apr 14, 2024 Join Chad Orzel, a physics professor, as he discusses the history and complexities of timekeeping. From Galileo's innovations to the relativity of simultaneity, explore the philosophical and scientific implications of measuring time accurately. Learn about attosecond clocks, the future of education post-COVID, and the intricacies of defining time in a universal sense.
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Longitude Needs Accurate Time
- Longitude requires knowing time at two places because Earth rotates and lacks a fixed longitudinal marker.
- A time difference between locations directly converts into longitude difference.
Time Is Convention Plus Physics
- Timekeeping choices are conventions built on assumptions like Newtonian or electrodynamic laws.
- Einstein showed synchronizing clocks forces us to change our notion of time to keep light speed constant.
Gravity Changes Clock Rates
- Gravity affects clock rates because of the equivalence between gravity and acceleration.
- Experiments measured light frequency shifts consistent with general relativity's time dilation in gravitational fields.