Lewis & Short

sphaerĭcus, a, um, adj., = σφαιρικός, of or belonging to a ball, spherical: motus, Macr. Somn. Scip. 2, 14, 31: numeri, Boëth. Inst. Arith. 2, 4.
Hence, subst.: sphaerĭca, ae, f., spherics, the science of heavenly motions, Boëth. Inst. Arith. 1, 1, p. 11.