Horizons in Bianchi universes

There are two ways to introduce horizons in anisotropic spatially homogeneo us universes: in the first one the anisotropy appears directly in the defin itions, whereas in the second way a "mean horizon" is defined, with a conse quent loss of information on the direction. In this work we give the expres sion of horizons in all nine Bianchi types, using the Misner parametrizatio n of metric. We examine, also, some examples regarding the Bianchi type I; in each case the achieved expressions are compared with the correspondent m ean horizons.