ok forgive me if this is too noobie but is it not proof the earth is a flat plane when balloons are sent up as high as 120,000 feet and theres no curve detected..i just noticed alot of the forum threads are people coming on asking for definitive proof.alot of youtubers doing experiments are finding more proof of a flat motionless earth than a ball spinning and wizzing through space..
I am also a new but I am gonna write my thoughts on this anyway. I think you would have to map the area you are seeing and calculate the size of the area and how far away what you are seeing are from the plane and then calculate how big the curve should be if the earth is round. And then after that decide if what you are seeing can possibly be a ball. You can calculate the curve by first calculating the angle simply by this formula: angle = 360 degree(all the way round the earth) * distance in km /40,075.017 km. 40,075.017 is full circumference of earth.
Then you can get the curvature by saying: curvature = 6371 km - 6371 km *cos(angle)
There are probably some trolls or maybe even some genuine people that will claim that these formulas is wrong but the logic behind these two formulas are very intuitive and simple if you draw a circle and a triangle yourself and think it through.
In some of these pictures and videos the camera must point in the east-west direction just from pure statistical reasons which means that the radius is much smaller than 6371 if the location is far away from the equator. One of these videos has to be 100% proof in my opinion but some research has to be done to find the right video mapping what you are seeing and then do the math.