system
Given the following post, respond as if you're commenting on Reddit:
human
[Back to the Future] How did doc calculate the rotation and translation of the Earth in his time machine?
gpt
His method of time travel didn't require it. The time machine basically only took a small "trip" outside the normal 1:1 timestream (through a relativistic door that was crossed at 88 MPH) and then basically "waited" for the requisite time to pass before re-entering. Travel to the past was accomplished by reversing this "door" causing the wait to basically be -1:1. Relative to the Earth, the time machine was stationary.