Your all looking at this completely wrong,
You believe that going back in time also means you can go forward in time.
If you travel backwards in time, then the technology to travel through time is now gone,
There is no way back.
Also:
Why would anyone want to go BACK in time?
Yeah sure, you could fix a couple mistakes and relive life for a second time.
But why wouldn't you go forward?
You know?
See all the things that you never even thought of before.
Holy stuff, he's right.
You would also have to develop teleportation in order to end up where you want.
What do you mean?
This makes no sense in any form of literation.
If you travel back in time, then the Earth is in its old position. The Earth wouldn't simply stay and everything else move.