Boats disappearing over the horizon is favorite evidence of Earth's curvature. Virtually any source--Google, Wikipedia, AI, books, etc.--will feature this as proof.

Anyone standing on the seashore can see boats apparently drop below the horizon. The horizon where the boats are disappearing, left to right, is not seen to curve but that's said to be because the Earth is way too big to see a curve.
 
Boats do disappear to the naked eye after they have traveled away from the observer beginning at about three miles. That would mean the Earth is curving in those three miles, and dramatically so.
 
However, upon magnification, boats reappear fully atop the water, not hidden below a curve.

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​Moreover, to the naked eye, things disappear in the distance due to the limits of human vision and perspective. As we learned in grade school art class, objects shrink and disappear into a vanishing point. That's perspective, not planetary geometry.

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​There is also this contradiction.
 
If Earth curve causes boats to disappear in three miles due to a dramatic Earth curve, why is the horizon not curved looking at it in all directions from high elevations, as in this picture taken from 100,000 ft with a non-distorting lens?

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So, the argument that boats drop below an Earth curve cannot be true.
 
Magnification brings them into view, perspective makes them vanish, and no curve of the horizon seen over hundreds of miles means no curve in three miles.
 
Here's the bigger issue. Since modern cosmology and cosmogony are stories dependent upon interdependent parts--a gravity force, specific masses, shapes, speeds, distances, etc.-- removing or changing any part unravels it all.
 
A curved Earth is a fundamental and critical part of everything we have been told about the solar system, the Universe, and our origins.
 
Why, then, do authorities continue to push disappearing boats as proof, even though it's an optical illusion? Because no curve would threaten the entire narrative we're taught to accept without question.
 
No curve means no spinning Earth rotating and gyrating through the Universe at 2.8 million mph. That means all of Big Bang modern cosmology, cosmogony, and space travel is a fabrication that only serves to fit an agenda of the powers responsible for the lies.
 
However, we've all been conditioned to believe what we've been told by authorities. But belief is not knowledge. And to know is the only path to truth.
 
To see past the programming we need fresh eyes, a willingness to question the "obvious" truths, and learn what we do not know.