If you only want to go back as far as 2nd half 20th century, there are probably logs of GPS devices, possibly available to future travelers, that could help min

If you only want to go back as far as 2nd half 20th century, there are probably logs of GPS devices, possibly available to future travelers, that could help minimize this problem. Then if you want to go back a little further, the effect is smaller than it would have been, since you "made it" to a predicted location. Or maybe it "hasn't" been solved, and ʻOumuamua took a really long time to "get back" ... "here." https://en.m.wikipedia.org/wiki/%CA%BBOumuamua https://en.m.wikipedia.org/wiki/%CA%BBOumuamua