2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10658I discuss two cosmological tests to determine the cosmological density parameter Ω_0 the cosmological constant λ_0, which make use of the anisotropy of the two-point correlation functions due to the peculiar velocity field and the cosmological redshift-space distortion.10 pages. LaTeX (revtex style) text and 5 postcript figures. To appear in the Proceedings of Asia Pacific Center for Theoretical Physics Inaugration ConferenceAstrophysicsΩ_0 and λ_0 from galaxy and quasar clustering: cosmic virial theorem and cosmological redshift-space distortiontext