Well if you want to know if the Earth is round or flat, the easiest way would be to attach a phone to a balloon and have it record all the way. But lets say you don't want to believe your phone and the government controlled your phone and added fake footage. The option for you would be to become an astronaut and go to space. After escaping orbit, look at Earth. Is it round or flat?
Oh my, you can't even get the question right, or dont know the difference between sphere and round.
Here i help you. Is it an oblate sphere (Nasa shows blue Marble Globe) or a round flat Earth?
Get used to the fact that you live in a Geo Thermal Pocket on the Infinite Plane with a parallel running Infinitive Firmament.
Here save time, phone and ballon, almost 200 miles and its eye level and flat.
https://www.youtube.com/watch?v=4UFXWinlB14AstroNOTs, like this bunch of liers?
https://en.wikipedia.org/wiki/Space_Shuttle_Challenger_disasterChallenger Crew
Comander of Challenger Richard Scobee
Challenger Pilot Michael Smith professor in his second life
Challenger Payload Specialist Sharon McAuliffe, this days a law professor
Challenger Mission Specialist Ronald McNair claims his twin brother flew
Onizuka also claims to be twin brother
Challenger Mission Specialist Judith Resnik, now a Yale law professor
Identical voice and moves: https://youtu.be/0DYro3HWeZMUnknown what happened to
Gregory Bruce Jarvis (maybe he was the sole traveler)