NASA and modern astronomy claim that Earth is a sphere, but not a perfect sphere, an "oblate spheroid," and not only oblate, but even bigger in the southern hemisphere like a pear.
Heliocentrists have contended this for centuries now because the Earth was conclusively proven to be flatter than they originally claimed, so they back-peddled re-labeling it an oblate spheroid flattened at the poles.
Then it was proven that the area in the southern hemisphere exceeded that of the northern (as consistent with the flat-Earth model) so they reverse-engineered another damage-control explanation that Earth is actually not a sphere or oblate spheroid but a pear!
Watch the following clip of NASA ultra-shill Neil DeGrasse Tyson trying to explain their pear-shaped Earth.