Ok, I discovered this one week ago, and being researching since and... Wow, what-the-hell?? Diferent from conspiracy "theories" that people can choose to not believe, besides lots of true facts/arguments/etc, this "theory" of a flat earth is a different case: It's already proved without doubt, by experimentation and by what we know is the reality we see. There is NO SPACE FOR ARGUMENT!! Certain experiments CAN'T BE DENIED!!
Some examples:
Fact 1:
ERASED: My mistake, this fact was wrong. But anyway, I discovered later that there is lots of other proofs, so I am not in the mood to post another one as -fact 1- here whithout necessity (and because people answered this topic with the previous "fact 1").
In here you can find lots of info to remove doubts:
http://theflatearthsociety.org/forum/index.php?topic=17760.0Fact 2:
If I am on the other side of lake Ontario, on Toronto, and I am some 40 kms away looking at the CN Tower, I see the whole of the city on the other side completely straight/plane. Now, if someone is in doubt if the water until my position towards the tower is flat, I just need to go 20 kms towards the tower, then turn to the side 90 degrees and go more 40 kms, so that I can look at the tower and my previous position to see: the water is completely plane from the position 1 to the tower, case closed.
-We always see the horizon without any curvature, even in the ocean and on high altitudes (like some 3-4 kms in a baloon (I never went in a airplane) and on top of mountains).
There is a bouchet explanation that this "ilusion" is caused by refraction of light, and I say "yeah, this refraction effect works all the time on all places on earth, all through history, on all the different climates, and always "fixin" the curvature just enough so that we see a straight line."
Fact 3:
Long tunnels, or part of tunnels, around the world, that when you look at the exit light, while being on the entrance, you can see it's a straight/plane nivelated line. You look at the tunnel by the side on the distance and you see it is a straight line. It was projected and build to be a straight line. Yet... I am supose to believe that it is a curve, that some refraction of light prevents me from seeing his true form?
Fact 4 - The FINAL one (I consider this one the best):
Speaking of tunnels, what happens when we see the exit of a more or less long linear and nivelated tunnel? The "light at the end of the tunnel"?
We see a small bright square perfect on the line of our vision (since it's a straight line, the light of the exit of the tunnel is hitting the center of our eyes in a straight line). It's the same effect that we see when we look at a pipe and see the circular small exit in the other end, we all know this.
If we crouch or if we jump, while all the time looking straight to the front (180º degrees), the exit of the tunnel is always on the center of our vision, on the same level, no matter if you position your head on the ceiling or on the floor.
So far this is undeniable by everyone, if you don't remember you can just take some straight pipe or something like it and move your vision up and down while looking in it.
this effect ONLY happens if you are looking at straight lines, because we SEE in a straight line (if you look at a thing, you know you ARE looking straight at that thing). If there is some curvature on the tunnel, then the exit, if you can still see it, will never be on the same line of your vision (when you are looking straight). If you look straight inside a curved pipe you know you will be looking at the "ceiling", not the exit.
Clear enough, so far so good?
What you think the horizon is? The horizon is a perfect straight line, a corridor. The line of the horizon is always on the line of our vision, when looking straight/nivelated/180º. If you go up the tallest building you can go, or mountain, or inside a baloon (I never went into a plane, haha), the effect is still the same, giving the effect that we are living in a concave world (go on the hightest place inside a boat when you go to the ocean and turn around while always looking straight, it's like you are inside a bowl (same effect on others very high places).
-But now someone should ask: "but if Earth were a globe, how the horizon would look like? what effect would happen"
-Answer: With everything progressively going down in altitude, the more far away from your position it is localizated, and give the size of the "globe Earth", on the ground it would look like more or less the same, but the curvature on the sides would be really aparent on the distance. But one BIG difference: the more high you would go, the more and more the line of the horizon would go BELOW your line of vision looking straight. On the top of a high building or a mountain, the line of the horizon would be WAY BELLOW the straight line of vision (plus the curvature WOULD HAVE to be really aparent on high altitudes). The bowl effect would not be able to happen for 2 reasons: the curvature and the fact that, for the land on distance, there would not be enough altitude to reach the straight vision line (the land/sea would not magically go up to the sky to reach your straight line of vision while in a high building or looking to the ocean while on a high place, logic my friends (although this one can be a little hard to visualize on your mind)).
-If you want to do the test yourself, download the Blender program (or some other 3d program you know how to mess with), learn a little on how to mess with it, open a picture of some map of some region of the world. Now enlarge the picture to a super gigant size, let more or less equal to the size of the map on reality or just make it gigant.
Now open a picture of the sky, position it upside down on top of the map, increase to the same size you have increased the map, position it higher than the map and put your camera on top of the map (let the angle of the camera straight too). "Look, it's the horizon...", play around and see that it's exactly the same effect wee see on reality, including the bowl effect.
NOW: google earth is horrible for this because, by what I know (and I guess it was on purpose), since there is no marker of the angle of the camera on the screen (there is using the "yellow pin" marker, but when setting the angle straight, you have to fix the distance to the object as well, and in the end you stay "glued" to the floor), no crosshair on the center of the camera, and, when looking straight, I could not discover some way to increase the altitude, it is better to download a 3d Earth globe to open it on Blender or some other program. Position the 3d globe inside a bigger globe with the texture/image of the sky (to simulate the sky), and position the camera on top of the land, better if on some high place you know... and look around.
On blender, while looking throught the camera, press "r" and then "z", a line will appear from the center of the camera pointing to your mouse arrow, now by moving the mouse the camera will rotate left or right without change the angle, at same time that you will have a way to look at the center/look straight. On a flat surface the center is the center of the horizon, on a globe the horizon is below the center even on small altitudes (if I tested right) and it keeps going way down the more you go up (and the curvature is super visible).
FINALIZING:
Now, don't matter if you are naive/innocent enough to still want to believe that the guys who control the governments of the world, the midia and entertainment, universities, research centers, science fields, Nasa, etc would be incapable of lie on this magnitude and hide from people this for some more than 2 centuries, or if you simple want to decide keep believing in a round earth. You know why don't matter? because this examples above have destroyed the floor of this lie, you simple can't look back, after have read and understood what I just said, and say to yourself, without lie, "it is not truth, it can't be, aaaahhhh", hahaha.
And it has to be a lie that before 1800 or 1700 humanity in geral believed for a fact that earth was round, I bet it was the other way around. More so because the majority of people was catholic (and others protestants) and the Bible says that Earth is plane, and universities and science was certainly not that contamined by this guys's lies yet.
And it was a shock to me too, on the last week, but now is a little bit fun to think about what the other things relacioned are lies too. And as I said, you can't turn back because the cover of the lie is gone, you can only choose to not think about it if you want, but you have to be crazy to not see it (and look at the irony here, the crazy people were not the ones that believed in a flat earth, but the inverse, haha (and kind of awesome if you think in a certain way).
WARNING: it's high provable that liers, servants of the evil guys (that obviously lurk on this forum), will post lies to attack this post bellow this point (or offenses), it's with you to think for yourself and recheck what I said (or lot of other experiments that you can do or read about).
And moderators, sticky this post or come with a better one, one full of pictures and videos by preference.
EDITED: took off "fact 1", it was not all wrong, but exagerated, my mistake, haha.