I am a glober and have some knowledge about how the Sun works on the globe model. The Antarctic Circle (66.5° South) is defined by the fact it can observe 24 hours Sun for 1 day a year (the December solstice). Traveling further south, that period becomes longer and longer. At the south pole, its 6 months. I've heard all the "we can't explore" reasoning for why an Antarctic venture isn't worth it for flat-Earthers. Proving or disproving the midnight Sun in Antarctic region should be paramount and you don't even have to be on the continent itself to view it. Where is the crowdfunding and interest in FE that can get somebody or a group down there? And even if you don't want to go to the Antarctic circle, surely seeing 23 hours of Sunlight slightly further north (on the solstice) would still be good enough evidence against flat-Earth, yes?