Elipticitet

Elipticitet ili spljoštenost obrtnog sferoida predstavlja meru pomeranja pola prema ekvatoru.

${}_{x}f=\text{ver}(o\epsilon )=2{\sin }^2\left(\frac{o\epsilon }{2}\right)=1-\cos (o\epsilon )=\frac{a-b}{a};$

$f^{\prime }={\tan }^2\left(\frac{o\epsilon }{2}\right)=\frac{1-\cos (o\epsilon )}{1+\cos (o\epsilon )}=\frac{a-b}{a+b}.$