I'm fairly new to astrophysics, but i'm genuienly intrested on knowing how to calculate orbits. I've been trying to do so on my own but I just find myself extremly frustrated. I'm trying to figure out what orbital vectors are and how i can calculate them using known orbital parameters. If i can get over this hurdle i should be all set. thanks. P.S. any sites that are helpful (lists of equations, sources etc.) would be appreciated.