Projected axis ratio of an oblate spheroid
= Projected axis ratio of an oblate spheroid
{title2=$Q$}
If the symmetry axis of an <oblate spheroid> makes angle $i$ with the line of sight, its projected axis ratio satisfies
$$
Q^2=\cos^2i+q^2\sin^2i.
$$
Thus a face-on spheroid appears round and an edge-on spheroid reveals its intrinsic axis ratio.