Radio sky should be fitted directly to optical sky in order to exclude radio refraction in the Earth atmosphere and ionosphere which is large enough in the radio-frequency range and which is as yet little understood. The method of fitting radio sky to optical sky used by us has increased by tens times the number of the radio sources identified with optical objects. The correct optical identifications will make it possible to investigate the characteristics of stars in the broad wavelength range, to study their nature and evolution, determine their location (distance) in cosmic space, to study the nature of diffuse objects and quasars, which will give us the true picture of all processes occurring within the observed part of the Universe.