Photo from https://wiki.tfes.org/Flat_Earth_-_Frequently_Asked_Questions

Despite initial observations over two thousand years ago by Greek philosophers like Pythagoras and Aristotle, as well as newfound evidence from NASA and other organizations in the modern age, there is a small group of people that still believe that our beloved Earth is not a sphere, but it is flat. In fact, there is an entire Flat Earth Society that seeks to investigate the controversy and convince people around (or across… if you are a flat-earther) the world that what we are being told about our planet and solar system is a fabricated lie. The Flat Earth Society seeks to promote the Flat Earth movement across the world and question the accepted doctrine that our Earth is indeed round. It is a large challenge to the authority of the shared belief about our universe as we know it.

Now, obviously there are satellite photographs, first-hand accounts from space, evidence about gravity, day/night cycles, seasons, and the ability to circumnavigate the globe that support the idea that the earth is indeed a spherical planet. However, Flat-Earthers reject each and every one of these explanations. 

Flat-Earthers fundamental belief is that what we observe around us as a flat environment should be taken literally. The ground appears flat to us, so why would anywhere else on the earth be anything but flat? How could the dirt beneath us be curved? Flat-Earthers truly have a counter-argument to every known fact that governs the Round Earth Doctrine as we know it. Though most people believe we have been to space and have seen the Earth to be a sphere, Flat-Earthers claim that the space organizations of the world have conformed to create a conspiracy faking space exploration, probably due to the competitive nature of the space race in the mid-1900s. They claim that the photographic evidence that depicts the Earth as being round is manipulated and computer-generated, therefore being untrustworthy as a valid source.

Then how are we able to navigate around the entire world? Easy, Flat-Earthers say. Some of the most popular flat earth models consist of the Earth being surrounded on all sides by ice in order to hold the oceans back, with the North pole sitting in the middle. Traveling “around” the world is easy, and no explorer has ventured past the ice or what Round-Earthers consider to be Antarctica. 

What about the day and night cycles? For Flat-Earthers, the sun lies above the Earth and revolves in circles. The sun’s light only hits certain parts of Flat Earth at certain times, and thus people on different countries and time zones experience different day-night times. 

It is quite difficult to invest yourself into the distorted realities in which Flat-Earthers live and perceive the world around them. Despite the wealth of scientific evidence that rejects their beliefs, the Flat Earth Society remains prevalent and seems to continue to gain support as years continue to pass. What is it that makes some people so resistant to scientific findings and discoveries? Perhaps they are all right, and we who understand physics and measurable proof are confused…

Most Flat Earth Society claims were taken from their wiki page: https://wiki.tfes.org/Flat_Earth_-_Frequently_Asked_Questions