- An more likely alternative to the concept of Doc calculating all of Earth's movement is that there is no spatial displacement when the DeLorean moves fourth-dimensionally, and that it maintains the same location relative to the Earth, though not existing in three dimensional space during the time jump. Hence, during the one minute between 1:20 and 1:21 am, the DeLorean disappears and returns to the same location on the parking lot. In the intervening minute, the DeLorean is at the location, but not in three-dimensional. On Marty's trip to 1955, the DeLorean is at the same relative location on Earth, near the Fox Photo kiosk during the 30 years, with no passage of time for Marty as the DeLorean travels fourth-dimensionally.
- On the trip back, the DeLorean is in front of the Statler dealership for 30 years, but not within the third dimension, and with no passage of time for Marty. This would be consistent with Doc's 25 minute experiment, a confirmation that time would not pass within a defined space under certain conditions. The question of whether the DeLorean could occupy the same space during its travels is not reached, as the vehicle is never at the same relative location in the ten departures/arrivals seen in the series. -- —Unsigned comment by McFord (talk • contribs).
- I believe this article should reflect the intent of the writers of BTTF, and there is no mention of spatial displacement until the animated series. Bob Zemeckis, in the documentary feature Making the Trilogy: Chapter I specifically mentions that time travel films should depict travelling only in time at the same location on Earth, following the example of H.G. Wells' The Time Machine, and the time travel jump should not transport them somewhere else on Earth, or consider Earth's motion through space. Proof of this intent can be seen in the fire trails the DeLorean makes after it physically disappears that depict where it will be travelling (relative to the ground) in its destination time. If the DeLorean used a galactic coordinate system, then the fire trails would extend millions of miles out into the sky (or through the Earth) to the place in the galaxy where the Earth will be at the destination time, but they don't. Instead, the shape of the "backward 9" trails at the end of Part II, and the "future bridge" trails in Part III, would only be possible if its motion during temporal displacement is somehow tied to its location on Earth, even when flying. Western Union 07:56, November 26, 2010 (UTC)
- Consider that in comparison to The Time Machine, the DeLorean must be moving forward anyway as it enters temporal displacement. -- Riffsyphon1024 12:56, November 28, 2010 (UTC)
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