You also have to account for motion of the earth and the sun. Let’s say you go back in time, say 100 years,....maybe it could be done ...but then when you get there...you’ll be at least a partial light year away with no way to get to Earth of the past. You’d have to travel in a spaceship to get there and you’d have to find it as there is no assurance that when you went back 100 years, that you would be in the same place that you were when you left 2025 so that you could track it to the place it was in 1925. No way to know if the time jump won’t spatially leave you 100 years past but in a distant galaxy and no way to go home!
I like how you think
Good point.
That is why “time travel” must in fact be “space/time travel”.
The coordinates must be spacial as well as time coordinates—and needless to say the travel method better have zero defects or the traveler is very dead.