Let's Talk FE
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I've watched ships "sink" over the horizon as they travel to other continents. I've also observed the northstar not being visible while in the southern hemisphere, due to it being over the northern horizon.
Vanishing point
Perspective
These things are 101
Any FAQ flat earth video covers these obvious questions
We were miseducated.
The primary reason for both of those phenomena is not the shape of the earth, but the density gradient in our air.
I recommend watching, or better yet - doing, some demonstrations on light/lasers into density gradients to understand better the path the light takes from the distant sources (as well as why it stops reaching you, and where it goes).