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Movie series show that Dr. Emmett Brown can adjust time machine to go a somewhat selectable/quantized time in future or past.
Especially "today but exactly N years ago" quote seems to be showing a calculation of earth orbit around sun so it doesn't pop out in space after the journey.
Question: what is giving that car, the power of computing of N years of earth orbit to make it "land" in the same XYZ space(and surface) coordinates, within just the time of acceleration from 0 to 88 mph (1 minute?)?
Earth is not only moving around sun, but its rotating too! Same XYZ coordinate may not be same after exact N years! I mean 1 year is not exact multiple of 1 day. And in N years, even earth rotation could change some milimeters per second. Add the gravity effect of unknown celectial bodies orbiting sun, it would be a lot harder to compute.
Even if its possible, what about people? Very lucky that not a single human was harmed after time travel landing. They could have killed some people with delorean car.
Maybe flux-capacitor is a super computing neural network that computes time-space travel trajectory such that it always lands on asphalt(or desert sands) at the same height?