Eötvös Effect: Evidence of Spherical, Rotating Earth

Eötvös effect is the change in perceived gravitational acceleration when moving eastward vs westward. An object will weigh more when moving westward than when it is stationary or moving eastward.

The effect was discovered by Loránd Eötvös in the 1900s after noticing the difference in gravity measurement on moving ships. He noticed that the readings were lower when the boat moved eastwards, higher when it moved westward. He identified this as primarily a consequence of the rotation of the Earth.

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