He also emphasises that the roundness of other planets and moons in our solar system supports his truth and how if the Earth were flat, then shadows would be the same length, regardless of location.
A total lunar eclipse will be visible tonight across the Western Hemisphere, for those willing to stay up late.
It's one of the biggest conspiracy theories of all time. But if you believe the world is flat, a NASA scientist may finally change your mind with a brutal putdown.
Dr James Garvin explained how great 16th Century mariners set off because they knew the Earth was round and would be able to go across one ocean and come back home the other way ...