  This paper analyses cosmological observations within inhomogeneous and exact
solutions of the Einstein equations. In some way the analyses presented here
can be freed from assumptions such as small amplitude of the density contrast.
The supernova observations are analysed using the Lema\itre-Tolman model and
the CMB observations are analysed using the quasispherical Szekeres model. The
results show that it is possible to fit the supernova data without the
cosmological constant. However if inhomogeneities of sizes and amplitudes as
observed in the local Universe are considered, their impact on cosmological
observations is small.
