this post was submitted on 23 Jun 2023
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Problem: the basic Newtonian mechanics involve the subtle gravitational influence of absolutely everything in the universe, all of which is in constant motion. You can estimate where the Earth was/will be, but not calculate it with anything close to complete certainty.
For all we know, our galaxy was yanked 40 megameters to the left by a black hole passing by its core 26,741 years ago, so your estimate of Earth's position 250 years ago is slightly off…and by “slightly” I mean your time machine deposits you in high Earth orbit. Oops.