An equatorial diameter greater than the polar diameter makes the Earth this type of spheroid
... Because of this, the 
diameter of the Earth at the equator is about 43 kilometers (27 mi) larger than the 
... equatorial diameter of 12,756 km (7926 mi), and a polar diameter of... [DOC] [TLE] Equatorial bulge - Wikipedia [PAR] An equatorial bulge is a difference between the equatorial and polar diameters of 
a planet, due to the force exerted by its rotation.