2) The horizon always rises to the eye level of the observer as altitude is gained, so you never have to look down to see it. If Earth were in fact a globe, no matter how large, as you ascended the horizon would stay fixed and the observer / camera would have to tilt looking down further and further to see it
So... I think what they are trying to say is that if you stuck a camera on a pole and raised that pole 20 miles into the air, it will still see the earth straight ahead of it, but if the Earth was round you shouldn't be able to? I think?
So, to get my head around this I watched this video
https://m.youtube.com/watch?v=Q-LE-jJQLTM
This shows an amateur camera going up into space, and several things strike me. Firstly, the horizon definitely looks quite curved. Secondly, the camera is moving around quite a lot, and thirdly, the horizon seems to change quite a lot. The horizon is not a fixed thing, instead it changes the further up you go. From this video at least, I can see how you might think that the horizon is staying flat but in reality it is just moving further away the higher up you go, creating the illusion that it is staying still.
So basically, I think that a lot of point 2 is incorrect. Again, no sources, no links to peer reviewed documents describing journeys into space, no footage... Fact checking is hard.
As always, I'm open to correction on this. I feel like I need to stick a note on my head saying "not a physicist/engineer/space scientist", but to me this seems a logical explanation.
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