Can you time travel without being able to alter your location in space? I mean, the earth is moving pretty fast, if you popped back a few hours, wouldn’t you land in empty space?
Better to appear some distance out into space and then fly the last few hundred miles to earth.
Maybe time travel would stay in the same reference frame, so if you're on the Earth's surface you end up in the same position on the Earth. On the other hand if you're on an object that experiences non-gravitational directional changes in the span of your time travel, you might be in trouble.
Kind of like the difference between wormhole based FTL and warp drive based FTL. In one, you just teleport, in the other, you still travel in a continuous line.