I love/hate flat earthers. They are absolutely fascinating and amazingly it is a growing belief (and yes, it’s not pisstaking, lots/most of them genuinely believe this).
I’ve spent a fair amount of time chatting to them on YouTube and Facebook.
As batshit mental as most of them are, some rare ones do occasionally ask interesting questions and it can be an interesting pedagogical exercise to figure out the answer and try to explain it clearly.
(Unfortunately if you successively do challenge a belief this way then they just say you must be a NASA plant or a government shill 🙄 )
My favourite head-scratcher is to ask them about stars. We can’t see the Southern Cross from the Northern Hemisphere. Folk in the Southern Hemisphere can, but they can’t see Polaris. Folk near the Equator can see both. How does that work on a flat earth?
Anyone with a camera can go outside on a clear night and take a long exposure photo of the sky. If they are in the Northern Hemisphere they will get an image showing the stars appearing to rotate around Polaris. At the equator they’ll get an image of the stars going across the sky. And in the Southern Hemisphere they’ll get an image of the stars appearing to rotate around a point near the Southern Cross.
Best answer I’ve had to this conundrum?
The celestial dome was created by God and is beyond human understanding. 🙄