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In 1971, scientists bought airline seats for four atomic clocks and flew them around Earth; when they returned, their time no longer matched clocks left on the ground

FinSiddhi

In 1971, atomic clocks embarked on a global journey aboard airplanes, revealing fascinating time discrepancies. Eastbound flights fell behind by nanoseconds, while their westbound counterparts gained time. This intriguing phenomenon validated Einstein’s relativity theory, demonstrating how speed and Earth’s rotation affect timekeeping. Additionally, the reduced gravitational pull at cruising altitudes impacted the clock measurements. Today, such relativistic insights are integral to the functionality of GPS technology.
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