i assume that there is then a relationship between time and space then.
so if you were going at .999 the speed of light would your time be .001 of normal? if so, from your frame of reference you sure would be MOVING.
that would be a vector almost completely in the direction of space.
now,
if from your frame of reference you were going .500 the speed of light, and .500 in the time direction(your frame of reference would be the speed of light, also what you describes as 45 degrees.)
would the world see you as moving near the speed of light, or are they only going to see the .5 speed of light.
basically what i am asking is, is there any way to find an almost equilibrium that you can travel at, and when you come back, you aged around as much as the people on earth.
i believe that what you say is true, but for a complete civilization this very greatly effects what we can learn. in the future there could be "time jumpers" that do what they can to learn as much as possible while the world ages behind them. crazy!