I stumbled on an article entitled, “Crash of relativity after Lorenz-Einstein” at: www.worldspace.nm.ru/en/articles/pdf/lor_e.pdf It is written by A.V. Rykov, Ph.D., chief of lab. Of Seismometry at the Russian Academy of Science. What interested me was his assertion that the speed of light is dependent on gravity. I quote (you’ll have to interpret through his broken English): “The speed of light versus gravity acceleration is given. “At start of space vehicles speed of light on the Earth is one, and in a free space it is another and difference is visible only in the 8th mark. For the Sun at which the acceleration of a gravity in 28 times more terrestrial, the effect of reduction of speed of light on a surface of the Sun is more and the difference is already in 5-6 marks of value of speed. In the research experts result the formula of dependence of Doppler displacement of frequency of a radio communication with “Pioneer – 10” – [del]v = v(sub)0V/c “That abnormal part of Doppler displacement of frequency depends not only on reduction of speed of movement of device “V”” rushes to eyes, but also from speed of light “c”. It is enough to determine a difference of speed of light in a free space from speed of light in a gravitational field of the Earth and the riddle of abnormal acceleration of the device can be solved so: there is no abnormal acceleration, and there is a dependence of speed of light on gravitation. It is remarkable, the increase of speed of light in space just coincides with is the sign of Doppler abnormal displacement.” Does gravity slow the speed of light?