Thoughts on Time Travel

Why is it no movies that feature time travel discuss the need to traverse space as well. It's just assumed that you'll traverse time and end up in the same planetary location or wherever you'll need to be. So, for argument's sake, let's say an actual "time machine" were invented. If you did traverse time as we know it and no measures were in place to "re-position" you to a specific cosmic location, you would likely end up re-emerging into some unknown portion within the void of space. If you didn't have a container to sustain yourself, you would die a very quick and painful death. You see, as time progresses (or regresses in this instance) cosmic locations change. Four million years ago earth was in a completely different location within the universe. Even further complicating the matter, it would be highly improbable to actually re-locate where Earth would have been. A mathematical assumption could be ascertained, however, this could not possibly take into account anomalies that would alter rotational trajectory even in the slightest. To sum up: Although I enjoy a good "time travel" movie, my mind is always telling me that they did not cover one of the main issues of traversing time......how do you safely traverse both time and space at the same time with infinite cosmic event possibilities?