But that’s the point that I’m trying to make. It’s probably my fault as I’m not very good at explaining things like this, and I’m not disagreeing with at all. I’m just saying that there is no way to have a machine or method of travel with a fixed point without knowing its relation to other objects. Just like you can’t know the trajectory of the Earth through space without knowing its relation to other objects. What I’m saying is that regardless of your “fixed point” you will have to do the same math, just in a different order depending on your point of reference. We are dealing with relatively here so the only variable that changes is your point of reference while the math stays the same.