The effect of the spatial anisotropy in the distribution of components
of particle momenta of the rotating Ar-3 cluster is studied at a give
n total energy and different values of the total angular momentum. The
Schwarzschild formula applied to describe this distribution gives thr
ee parameters which can serve as a measure of the internal temperature
s of the cluster. A new definition of the energy of the overall non-ri
gid rotation based on the Schwarzschild distribution is proposed.