"flattening" . "bulging" . "equatorial bulge" . "equator to bulge outward" . "oblate" . "bulges slightly" . "wider" . "diameter at the Equator" . "bulge around the equator" . "equator" . . "bulging at the equator" . . "Earth's flattening" . . . "flattening of the Earth" . "Equatorial bulge" . "Equator bulges" . "earth's radius vs. sphere" . "Equatorial bulge" . "bulges" . .