The time lapse is not long enough to show any altitude loss due to orbit. Are you referring to the actual angle orientation of the camera compared to the earth?
Yes, the angle is what I was referring to. I never mentioned anything about altitude. Maybe you misread when I said "attitude?"
Ok fine. Now just explain to me how the ISS was able to keep the exact same angle between it and "earth" for a third of an orbit, especially since you claim it doesn't use its own RCS.
You beg the question. The ISS is not in a circular orbit and does not keep the exact same angle between it and the Earth. Also the video capture is for more than half of an orbit. How did you measure that angle to determine that it was exactly the same throughout the orbit? With what precision can you measure that angle in any given frame? Wasn't the camera held by hand?
1) The ISS has a periapsis of 376 km an an apoapsis of 398 km. It is approximately circular. Either way, that doesn’t affect its attitude.
2) Actually, yes it does keep the same orientation with the earth at all times. This might not be relevant to this discussion, but still an interesting point of information.
3) The location of the horizon does not change, and you can see parts of the ISS in the picture. Therefore you have enough information to see that the angle does not change. There is no need to measure the angle, because it’s relative angle that we are worried about. That is, a change in angle between the previous and the current. It also doesn’t matter if the camera was held by hand or not since you can see both the horizon and part of the ISS in all frames.
4) It starts next to Canada and ends just as Antarctica enters view. Probably between a third and a half, definitely not more than a half. We're probably talking about 35-40 minutes.