re: Had a Conversation with a Flat Earth Believer Today

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Yes, an excellent way to disprove flat earth.

If that's how sunsets worked, the sun would shrink in size until it disappears. It would not sink below the horizon as we observe it to do.

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Erroneous example.

The Sun is always moving across the sky, transcending it from our field of ground vision. A "sunset" is merely the Sun leaving the "quadrant" or that field of vision and leaving it. The horizon represents its vanishing point. IF you happened to elevate yourself by 10' at that moment, the Sun would still not yet have "set". (and yes, the sun does grow smaller.)

A sun that is shrinking (as it leaves the field of vision) is smaller because it is now much further away than when it was directly overhead. This proven in many examples of photography -- if you want to research it.)