In the present article we have decided to exclude the effect of response curves and to compare synthetic color indices of the Sun with synthetic color indices for a group of G2 V stars which were included in the Alma-ata spectrophotometric catalogue , and were selected by us earlier . For the Sun we used data from a paper of Makarova et al. . In that paper, the solar energy distribution was derived as a weighted mean from results of five investigations. The standard error of the energy distribution is equal to 1.5% in the ultraviolet and blue regions and decreases to 0.4% in the red.
Color indices of the Sun and stars were computed in four photometric systems (UBV, WBVR, uvby, ,  and Vilnius, ) using the same stars in all systems. The result is that the Sun lies within of the G2 V area on all two-color diagrams. We think of that conclusion as being rather positive because only two basic quantities are compared in the case: solar energy distribution and the scale of the Alma-Ata spectrophotometric catalogue. Errors of an individual star energy distribution are quasi-random if a sample is rather extensive and increase a point scatter only without moving a central line. A hidden systematic error of the spectrophotometric catalogue  and errors of the solar energy distribution are apparently small, as it is impossible that they cancel each other to place the Sun near the central line.
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