  The model of the homogenous and isotropic universe is considered in which the
coordinate system of reference is not defined by the matter but is a priori
specified. The scale factor of the universe changes following the linear law.
The scale of mass changes proportional to the scale factor of the universe. The
model under consideration avoids the flatness and horizon problems. The
predictions of the model is fitted to the observational constraints: Hubble
parameter, age of the universe and CMB data.
