Can the Flattening Ratio be introduced in the next changes? To explain, the FR is a ratio of the square root of the sum of squares of two dimensions, to a third.
FR is a result of deforming forces acting on a rotating body. Centripetal force resulting from angular momentum causes a non-rigid body to flatten into an oblate spheroid. Diametrically opposing forces causes a non-rigid body to stretch into a prolate spheroid.
Flattening has some interesting effects on the thermodynamics of astronomical bodies, especialy on stars - flattening due to very short rotational periods can extend the life-time of large stars.