Keep in mind that time travel pretty much HAS to involve space travel to work at all. If one were to travel through time to the exact same spot in real space, to an arbitrary date and time, the rotation and position of the earth would have changed. In fact, given an expanding universe, even if one were to go to the right moment in time, say exactly one year ago taking leap seconds into account, the "real" location of the planet would be closer in to (the past) or farther out from (the future) the Big Bang origin point. And I'm not sure we even have a good coordinate system for measuring and placing the destination point -- almost everything we have ever had to calculate is relative to our own solar system.
Time travel to the same exact spot on a spinning, moving oblate spheroid in an expanding universe system means we have to somehow comprehend a relative system we can't currently even observe from any useful vantage point. Doc Brown rocks.
