3rd EAU Baltic Meeting, Talin, Armenia, 27 May 2016, vol.15, (Summary Text)
We use Vinogradov's method to prove equidistribution of a spin symbol governing the $16$-rank of class groups of quadratic number fields $\mathbb{Q}(\sqrt{-2p})$, where $p \equiv 1 \bmod 4$ is a prime.