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RE: Science answers why your weight varies depending on your location on earth and why the pendulum clock is slower at the equator
Geoid is one of the models used in the description of earth's shape in a process known as geodesy.
Sounds interesting.. I haven't even looked up geoid till now 😂. He told us the earth was a combination of a circle with the top and the bottom shaped in a flat manner which could be called geoid.