Answer to #2: There does not appear to be a shift in camera position relative to the planet or the background stars. (You can compare the two screenshots at Trekplace as they are approx 4s apart.) If the camera is moving it is not in a detectable means as my virtual version works with the camera stationary. Do you have any suggestion to how it might move so I can try it out?
Even though these were eyeballed by FX guys, they make sense in context to what we know of the majority of Enterprise's orbits. Lose power, fall from the sky.
The TOS Enterprise is not going fast enough to be in a natural orbit.
- How can you make this determination?
- What is the frame of reference of the camera (can't it be in orbit too, albiet a slightly different one)?
- Are you taking into account apparent the rotation of the planet and the length of its day?
The second of three questions is really the most important. The third question is important too, but it doesn't trump everything; since these scenes were not assembled with the aid of a computer, but rather were eyeballed, we know
ahead of time that they won't withstand detailed scrutiny.