The horizon always appears perfectly flat 360 degrees around the observer regardless of the altitude.
1. "appears" doesn't mean "is". Scale and distance are also factors.
2. You dismiss the legitimacy of any picture of the earth from an altitude at which you might see any curvature, so you really don't know if it is actually "regardless of altitude".
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In this first shot, the moon is observably in the distance.
In this shot, the moon is clearly and evidently local due to the increase in size.
In this shot, the moon is clearly and evidently local due to the increase in size.
Don't be stupid. Those images are different in scale or focal length. Flat earth or not, the size of the moon hardly changes as it moves around the earth. Flat earth theory attributes the constant size to atmospheric refraction.
Flat earth is not a theory but reality, your points are irrelevant to these facts.
