Time and space travel

Hello,

I know I already covered this but I was J-walking across Richmond Avenue today near Augusta and it occurred to me that time travel is not as simple as it may sound. I have no idea why that when I am crossing a street and hurrying to not get run over that I would think about such a thing but it is a fact.

In the movies, whenever there is a time machine, the "travelers" always end up at random places at random times since the "kinks" have not all been worked out. But since the Universe is everexpanding and Planet Earth is constantly moving, it is impossible that time travel would work without some fairly lengthy calculations.

As far as time travel goes a trip down "memory lane" is about as real as it is going to get. At least considering the parameters of the physical universe as we know it.

Like I said, I know I have covered this but I still am puzzled why I would be thinking about this while quick-stepping across the road to avoid traffic. This may seem like a trivial concern but so what?