Even if you could do the math, you’d need a starship to travel backward along that planet’s course through 3d space so that when you activated the time machine you would be in the same place that the planet -was- during the point in time to which you wish to travel.

The next problem would be relativity. If you used a FTL ship, the FTL bit would make your already ridiculously complicated math orders of magnitude worse. If you used a slower than light starship it would take many years to get back to the point in space you needed to in order to meet the planet there after time traveling.

* Wow. Even thinking about this is hard. I can’t even imagine being able to actually work this all out in reality. No wonder Sheldon is crazy. ðŸ˜‰

]]>The only way out I can think of is “momentum”. For fictional purposes.. Perhaps, since the traveler is standing on a planet that is already moving through space, and therefore carrying the traveler along with it, the physical, 3-dimensional, angular momentum of the time traveler lets him keep moving along with the planet as he also moves through time. Now, that may only work in one direction through time (forward), so that’s still why we don’t know of any true time travelers. Moving backwards leaves you in outer space. The people behind us in history don’t have the technology, yet, to move forward.

* (I do not believe we can all be considered as time travelers just by passing forward through time on a day-to-day basis just by living that time. I think we are just moving -with- time (momentum again), not “through” it.) ðŸ™‚

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