On a rotating spheroidal Earth, gravity increases from equator to poles due to two combined effects: the oblate shape (poles are closer to the center of mass, increasing gravitational attraction) and the decrease of centrifugal force (which partially offsets gravity, most strongly at the equator, vanishing at the poles); removing rotation eliminates only the centrifugal effect, leaving the shape-related increase intact and undiminished.
On a non-rotating spheroidal Earth (same oblate shape but without rotation), the centrifugal force component is eliminated entirely, removing the equatorial 'reduction' that partially offset...
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