  Recent analyses of the first-year WMAP data claim large-scale asymmetry and
anisotropy of the CMBR fluctuations. We argue that the covariant and gauge
invariant treatment of density fluctuations formulated by Ellis and Bruni can
explain the asymmetric and anisotropic WMAP data by including the vorticity of
the Universe. It appears that the spatial gradients of the density contrast are
proportional to the vorticity of the Universe, thus allowing measurements and
quantifications of the magnitude and axis of the possible cosmological
rotation.
