Abstract
Einstein's special and general theory of relativity abolished the Newtonian concept of absolute Moreover, Einsteinian physics revealed the mutual interdependence of space, time, and matter. Applying general relativity to cosmology leads again to the existence of a preferred time coordinate among the homogeneous and isotropic cosmological models. Einstein referred to this time coordinate as almost absolute time. What is the exact relation between absolute time in relativistic cosmology and absolute time in Newtonian physics? To answer this question firstly we investigate which features are characteristic of Newtonian absolute Secondly we show how the preferred time in relativistic cosmology is related to the cosmological principle. After that we compare the two concepts of Finally, we consider the concept of time in particular cosmological models like the static Einstein universe, the relation between cosmic time and the evolution of the universe and different possibilities to introduce the time coordinate in oscillating cosmological models.
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