Requiem4aDr3Am 11 minutes ago +jachin boaz Did ya not read through the entire back and forth in the comments? nearly 3,000 years ago the ancient greeks started thinking the earth was a sphere. This was verified with empirical evidence as Aristotle noticed that during lunar eclipses the shadow of the earth was curved and that it could be seen as curved from multiple vantage points. That is only possible if the earth is a sphere as no other shape could possibly produce a curved or round shadow from multiple vantage points. From there Eratosthenes did a shadow angle measuring experiment that showed him there was a difference of 7.2 degrees in shadow angles cast by the sun on the solstice in 2 different locations at the same exact time. He realized at that point that the earth is not flat and then applied his measurements and was able to not only calculate the circumference of the earth accurately, but then the distance to the sun as well as become the father of geography making the first models with latitude lines and grids marked out. From there other empirical evidence was found when people noticed objects disappearing over the horizon bottom first instead of all at once. This was due to the earth's curvature. Next we have geometry that supports a round earth simply by its definition. We can use geometry with equidstant triangular travel to verify the earths shape. If one travels in a straight line for say 5,000 km then turns 90 degrees to the right then travels 5,000 km more in a straight line then turns 90 degrees to the right again then travels 5,000 km straight again they end up back at their starting point. It is impossible to do that on a flat earth as it would end up making 3 sides of a square Then we come to the subject of the earth's rotation which brings us to coriolis effect. This is what makes hurricanes in the northern hemisphere spin counter clockwise and the hurricanes in the southern hemisphere spin clockwise. This is verified by using a foucault pendulum which measures the earth's rotation accurately and the motion is only possible on a sphere of a rotating planet. It is so accurate at measuring rotation one can determine their exact latitude with one.
From there we have more advanced techniques such as radio waves. Radio waves are blocked by the curvature of the earth and are limited by the horizon. VHF signals are extremely limited while LF waves can bend over the horizon for a bit but not infinitely. This is why they have a radio signal horizon.
We also have been able to use high powered radar to use on our planet and inside our planet that shows not only its shape but gives us an idea of what the inside is made of.
Also starting in the 1930s we began getting pictures from very high altitudes that displayed the curvature. In 1935 on the explorer II someone snapped off a picture at 72,000 ft that showed the curvature. And yes that was a manned balloon that made it that high. in 1946 v2 rockets were launched up with cameras on them and showed us the curvature as well. Then of course we have the 60s and the space race where we had the mercury missions, the gemini space walks, the apollo missions to the moon which returned footage and pictures all displaying the earth's shape. And from there we have satellites space shuttle missions, skylab, MIR, ISS that all have footage and pictures showing us the shape of the earth. I'm sure I left out some other proofs but this was just off the top of my head.
Remind me again where is the evidence for a flat earth? Oh thats right there isn't any. Remind me again where is the picture of the flat earth from space? oh that's right there isn't one because our planet is 100% confirmed a sphere.