Just keep the ball centered on the panel
The thing about time travel that I have not heard someone like the guest on Coast to Coast address is that space travel would be a part of it. Just think of the simple fact that as time goes by the earth is in constant movement around the sun, or is it Obama??? Any way, throw in the fact that the universe is expanding at a fantastically fast rate and the realization that in order to time travel, and “land” at a specific place on earth, you would need to travel great distances in space. From a fixed place in space, exactly how far did the earth move and how would you cover that distance IF you could travel through time?
Just keep the ball centered on the panel
As one who has put quite a bit of thought into the idea of time travel, I'd say you're spot on.
When discussing the subjects one of my first questions is always, "Let's say you can build a time machine. What else do you need?" Answer: a space ship.
The Earth - she moves!
The cumulative motions of the Earth, (rotational, and orbital), the solar system (orbital in relation to the galaxy), and the motion of the galaxy itself to a hypothetical point of rest in space is huge. If you were to travel just a year into the past, you'd need to travel further in your spaceship to reach the earth than any craft we've ever sent into space.