  Observations of distances to Type-Ia supernovae can be explained by
cosmological models that include either a gigaparsec-scale void, or a cosmic
flow, without the need for Dark Energy. Instead of invoking dark energy, these
inhomogeneous models instead violate the Copernican Principle. we show that
current cosmological observations (Supernovae, Baryon Acoustic Oscillations and
estimates of the Hubble parameters based on the age of the oldest stars) are
not able to rule out inhomogeneous anti-Copernican models. The next generation
of surveys for baryonic acoustic oscillations will be sufficiently precise to
either validate the Copernican Principle or determine the existence of a local
Gpc scale inhomogeneity.
