system
Given the following post, respond as if you're commenting on Reddit:
human
[General scifi] If I have a time machine that will take me backwards/forwards in time, but it stays in the exact same coordinates it was in prior to time travel, how far backwards/forwards do I need to go for the geography of the start to be different?

Ie, lets say I go back in time whilst I'm on a boat inbetween South America and Africa. I go back to before the two continents separated and now I'm on the super continent in whatever year that was. If I did that in other times, how far back would I need to go for there to be a major difference (like, at least a mile)?
gpt
I would think that you would wind up in the middle of space considering that the Earth is travelling 30km / second, the Sun orbits the galaxy at 230 km/s, and nobody knows how fast or in what direction the galaxy is moving relative to space. Relativity starts to get involved.