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This topic has really shown me my boundaries of intelligence. I still don't understand how it's not proof of a globe earth, that a large ship disappears over the horizon, bottom first, and when zoomed in on still does not expose the bottom part. It seems that if the ship gets zoomed in on and the bottom reappears it would NOT prove globe earth. It seems that if the world is curved, this would make sense.

I've seen video where the bottom DOES reappear after zooming in ... after it looks like it had disappeared, and after travelling a distance where it should not be there given curvature math.  There is an optical phenomenon where the bottom will converge with the plane underneath it.  And at some point the limit of the optics, the zoom, would be reached, and the same phenomenon would occur despite the magnification.  And then I've seen another phenomenon demonstrated where the bottom actually gets obscured by a mirror-image reflection of the higher part above the waves.  You can see birds flying over being reflected in mirror image on the bottom part.  But the bottom is still there, just optically hidden beneath a mirror image reflection of the higher part.

Given that one CAN observe the phenomenon of the bottom disappearing, and then have it reappear when you zoom in ... proves that the phenomenon is not necessarily related to earth curvature.  It's pretty simple logic.

I have seen flat earthers use lasers, sounds beams, and GPS devices accurate to within centimeters to demonstrate lack of curvature.  Unless the results were completely made up, and faked, that is the kind of proof that's irrefutable.  I've seen pictures taken by third parties who were not interested in the curvature problem where entire mountains can be seen from distances that should be impossible given curvature math.  Unless there was lots of "refraction" going on, then that would not be possible.

If globe earthers were to do the same thing, measure the distance between the tops of two buildings separated by a number of miles, and then compare it to the distance between their bottoms (assuming they were plumb and level) ... and show that the tops were farther away from one another than the bottoms, then I would consider that proof of curvature.  But I have not seen them produce anything like that.  I've seen one globe earther use lasers, but the result they had could have been achieved if the laser at the origin was tilted even slightly upward.  But when you do it the other way, and the laser still hits an object that should be obscured, that's much harder to fake.  Again ... unless the entire video was staged and fabricated.  I've seen flat earthers use GPS devices to show that the tops and bottoms of two buildings were exactly the same distance apart ... to within centimeters.  In addition to lasers, and GPS, they have used directed sound beams.

I don't trust anything that comes from NASA ... because they have been caught red-handed producing fakery.  They are on record admitting that their "pictures" of globe earth are composites.  And they have produced composites with widely varying look and sizes of continents, etc.  They've been caught using green screens while pretending that some astronaut was in space.  Why?

I get that. The point that the article I linked to made is that, there are times when you zoom in and it still does not come back. Some objects, no matter how much zoom you put on them, part of the object is still obscured.
There is the vanishing point where the object goes beyond your view. Some objects, you can zoom in on and they fully come back into focus. On the other hand, even with the best magnification cameras out there, there are larger objects where their entirety cannot come back into view past the vanishing. No matter how close one zooms. a percentage of the lower part of the object is still not in view. Globe earth says that it is over the horizon and being obscured by the curvature.
My point was that I don't know how a flat Earther would explain that. It seems to me that the only explanation would be that the curvature obscures the lower part of the object. We are only talking about objects past the vanishing point; i.e. out of view for our eyes.
Is this how you understand it and I'm still not getting it. LOL

As I said, there can be lots of explanation for this phenomenon.  Please produce something like the GPS experiment that flat earthers have used, and then I'm all ears
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Now, I have not completely bought into flat earth due to the claim that refraction is possible in some cases.  So I go both ways on this.  If there's another possible explanation for the phenomenon, then I don't consider it hard proof.  While I think it unlikely that refraction can explain all the cases I've seen, I can't rule it out.  Otherwise, I would be 100% convinced of flat earth.