![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Sphere-OblateSpheroidComparison.jpg/640px-Sphere-OblateSpheroidComparison.jpg&w=640&q=50)
Equatorial bulge
Outward bulge around a planet's equator due to its rotation / From Wikipedia, the free encyclopedia
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For the feature on some of Saturn's moons, see equatorial ridge.
An equatorial bulge is a difference between the equatorial and polar diameters of a planet, due to the centrifugal force exerted by the rotation about the body's axis. A rotating body tends to form an oblate spheroid rather than a sphere.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Sphere-OblateSpheroidComparison.jpg/640px-Sphere-OblateSpheroidComparison.jpg)
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