Let Ea, Eb, Ec be the excenters, P a point. Let Aa, Ab, Ac be the orthogonal projections of A on AP, BP, CP and Oa the circumcenter of AaAbAc. Define analogously Ob, Oc. The ninecenter Np of OaObOc lies in the Euler line. When P is the orthocenter H, the triangles ABC, OaObOc have the same ninecircle.