I had been trying to to do this. I wanted a network of relay communications satellites so i could use unmanned vessels. As you know, you need a satellite network like this so the unmanned vessels always have communications with Kerbin. Anyway I also wanted the network of satellites evenly spaced out in their orbit. I couldn't find any tutorials on this that explained the math so I went ahead and derived the math myself and made a tutorial video for the community at large. So Enjoy