This paper is written on the ballistic experiment description, which was the experimental testing of the second tenet of the special theory of relativity that postulates that the speed of light is independent from the emitted radiation velocity. This tenet was not known to have been supported by the decisive experiment earlier. The employed experimental techniques are described. Results of two experiments are given on the direct measurement of the relativistic electron-emitted synchrotron radiation photon propagation velocity in the storage ring and comparison of the synchrotron radiation photon times-of-flight under the conditions of the atmospheric pressure and high vacuum. The measurement results do not agree with the ballistic light propagation hypothesis, corresponding to the second tenet of the special theory of relativity.