I chose to write an essay on the "interesting" question I stumbled upon For part of it I am trying to calculate the Doppler shift in light with the relative motion of C. I suppose in the effort to not drone on for days I will first limit it to small, more simple questions and later,if we happen down a long path, so be it :). I used the Relativistic Doppler Shift Formula for trying to calculate/prove the blue shift. The value I came up with is -1.585...... I was expecting to get a value of 1, which would have indicated a forward, relative motion of one hundred percent the speed of light? So does any one know if The Relative Doppler Shift is capable of being accurate when using the speed of light for relative motion/velocity? If so than is my math incorrect?