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The empirical formula for the frequency shift of a radar signal returned from Venus, found in [2] as the best approximation to the observed data up to second-order terms in u/c is identical with a formula derived by the author directly from classical physics, and differs from the relativistic frequency shift. The paper shows the basic errors made by the authors of [2] in order to obtain "agreement" of their observations with relativistic physics. Correction of these errors leads to agreement of the experimental data with the classical theory of the propagation of electromagnetic oscillations and to the inevitability of perfecting the method of reduction of radar observations, which in the final outcome will lead to a higher precision of the ephemerides.

It is pointed out that the measurement of Maxwell's effect []t, or the measurement of "the velocity of the solar system through the ether by observing Jupiter's moons" [2] was not possible earlier, but has become possible now, provided a modification of the method [1] is applied, and the precise observations of apparent conjunctions of satellites or so-called "mutual phenomena of satellites" [4] (i.e., eclipses and occultations of one satellite by another) are used in addition to the eclipses and occultations of satellites by planets as proposed by Maxwell and in [1]. A further requirement for answering Maxwell's question [2] is an adequate reduction of observations. Since the problem concerns astrometry, celestial mechanics, stellar astronomy, and also fundamental problems of physics, it is proposed to involve the International Astronomical Union in evaluating the complex work plan and in solving the ensuing problems.

Does the observed speed of light depend on the motion of the solar system in space? To answer this question, systematic astronomical observations of the eclipses of the brightest satellites of major planets are proposed. In spite of the poor accuracy of present observations, they may help in obtaining (1) more accurate values of "true" speed of light in the interplanetary medium, and (2) the velocity of the solor system. The latter will be independent of the proper motions of stars and hence will stimulate the study of the kinematics of our Galaxy.