2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/171391In this paper we determine the structure of the Chow ring of the Delaunay-Voronoi compactification $\tilde{\cal A}_3$ of the moduli space of principally polarized abelian threefolds. This compactification was introduced by Namikawa and studied by Tsushima. We use equivariant classes on level coverings of $\tilde{\cal A}_3$. We also compare this ring with the Chow ring of the moduli space of stable genus 3 curves as determined by Faber.Plain TeX, 17 pages. This version corrects two inaccuracies of the Journal of Algebraic Geometry versionAlgebraic Geometry14K10text