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Reference.org
Equatorial bulge
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<p>An equatorial bulge is a difference between the <a href="/facts/Equator/CjaxbVaN">equatorial</a> and polar <a href="/facts/Diameter/6uNn4VmU">diameters</a> of a <a href="/facts/Planet/rbPjE6Bx">planet</a>, due to the <a href="/facts/Centrifugal_force/CWgvMw6w">centrifugal force</a> exerted by the <a href="/facts/Rotation_around_a_fixed_axis/PGcg3IY5">rotation</a> about the body's axis. A rotating body tends to form an <a href="/facts/Oblate_spheroid/GJyyLxQ7">oblate spheroid</a> rather than a <a href="/facts/Sphere/jywYLNM2">sphere</a>. </p>