  This paper concerns the most intriguing question of modern atomic physics:
determination of the proton root-mean-square (rms) charge radius ($r_p$). This
problem was announced by the difference in $r_p$ values extracted from the
experiments on measurement of transition frequencies in hydrogen ($H$) atom and
measurement of Lamb shift in muonic hydrogen ($\mu H$) atom. The both
experiments give the possibility for the very accurate comparison of values
evaluated theoretically and experimentally. As a result of this analysis the
value of proton charge radius extracted from the $\mu H$ experiment was found
on $4\%$ smaller than the value given by the hydrogenic experiments. For a
decade a lot of theoretical efforts were devoted to the search of 'new physics'
on the basis of such deviation. In this paper we reproduce the analysis on
determination of proton charge radius in the hydrogen atom.
