Agreed, although it's a bit disheartening that there's already a lot of photos on YouTube showing the sun getting "bigger' as it gets "closer". It's just flare though. Really you'd just need two photos, say at 8AM and 12PM (noon) (then maybe at 4 also). Again though the thinking that allows people to think "perspective" makes the sun go behind the horizon might also make it hard to them to accept this as evidence. Here's an interactive simulation of what the sun would look like. Posted by David Ridlen on Facebook http://tube.geogebra.org/student/2141849 I made a couple of GIFs for viewpoints in the Southern and Northern hemispheres, simplifying the text for easier communication. There are two thing to point out to the Flat Earth proponent: 1) The sun grows and shrinks in the Flat Earth model, but not in observed reality. 2) The sun never goes below the horizon in the Flat Earth model, but it does in observed reality.