hell two sticks and observing the shadow works too. this is how the ancients, without satellites, were able to accurately measure the circumfrence of the earth. modern "science" has forgotten about "observations" in lieu of garbage (easily manipulated) models.
Flat earthers have some damn good arguements at times though LOL
But you can easily disprove it. Fly to a foreign country and Skype someone you trust. Note the position of the sun.
hell two sticks and observing the shadow works too. this is how the ancients, without satellites, were able to accurately measure the circumfrence of the earth. modern "science" has forgotten about "observations" in lieu of garbage (easily manipulated) models.
Foucalt pendulums are effective too.
I saw a flat earther video where he proceed it to himself and he still denied it saying he just have done something wrong lol