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Douglas_Knight comments on Crazy Ideas Thread - Less Wrong Discussion
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One thing I've never seen people mention re: time travel is that if you travel back in time six months, say, you'll find yourself floating out in space with the Earth on the other side of the Sun. (The Sun is in a slow orbit around the Milky Way, which itself is moving, right?) So practical time travel also requires practical space travel?
Any system of time travel in which the traveler does not teleport through time, but instead traverses all intervening time somewhat addresses this. There is an implication that the vessel is held near the Earth by the same gravity that would have held it in place ordinarily. In particular, this was true in Wells's original story. I think that the film Primer addresses this explicitly.