  Arrival directions of ultra-high energy cosmic rays (UHECRs) exhibit mainly
an isotropic distribution with some small deviations in particular energy bins.
In this paper, the Yakutsk array data are tested for circular uniformity of
arrival directions in right ascension using 2 methods appropriate for the
energy ranges below and above $10^{18}$ eV. No statistically significant
deviation from uniformity is found in the arrival directions of cosmic rays
(CRs) detected within the observation period 1974--2000.
