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How Einstein's Theory of Relativity Prevents Your Phone's GPS From Drifting Miles Off Course Every Day

VerifiedPhysicsTechnologyScience18 days ago

GPS satellites run on atomic clocks that tick faster than identical clocks on the ground. Weak gravity in orbit speeds them up, while their orbital speed slows them down, leaving a net gain of roughly 38 microseconds every day. Without compensating for Einstein's theories of relativity, navigation apps would drift by about 10 kilometres every 24 hours. More

The Eiffel Tower gains fifteen centimeters every summer simply by getting hot.

VerifiedArchitectureMaterialsEngineering20 days ago

Summer heat adds about fifteen centimeters to the Eiffel Tower as seven thousand tonnes of puddle iron expand in the Paris sun. Thermal expansion forces the metal lattice outward, making the entire monument physically taller by July than it is in January. When the sun hits only one side, the heated beams push harder than the shaded ones, causing the summit to tilt away from the light. More