From supporters of the «theory» of flat land, you can often hear statements that they say all the space photos is a fake, which cannot be believed. But if the curvature of the earth’s surface could be seen himself, then there would be quite another matter.
Indeed, there are no points on the surface of the earth, when observed from which the curvature of the horizon line becomes noticeable, even the peak of Everest is not suitable for this purpose. Simple calculations show that the crumpled surface of the earth surface can be seen from a height of 10,800 meters since the naked eye. But at the same time you need to have an angle of view of at least 60 degrees. The porthole in the cabin of the passenger aircraft such an angle does not give and even in the pilot cabin at such a height, the curvature of the surface is barely noticeable.
More or less good to see the curvature of the earth surface could be from the salon of supersonic aircraft concord, but unfortunately they no longer fly. From some plane earths, I even had to hear that Concordian flights were therefore stopped so that people would not know the «truth».
So it turns out, except from the space or from the cockpit of the pilot of the aircraft can not be convinced, in the curvature of the earth’s surface? Fortunately, this can be done without leaving the surface of the earth and the most visual example is, in my opinion in the USA, in the state of Louisiana on Lake PilgarTrayin.
This lake crosses a bridge with a length of 38.5 kilometers and it could also be used to demonstrate the curvature of the earth’s surface. But even better this purpose is the power line for about 24 kilometers passing through the lake. In the photo you can see how the line supports go beyond the horizon and plunge under water.
All supports have the same height and line of gear strictly straightforward, i.e. According to the laws of perspective, the line connecting the tops of the supports and the line connecting the legs of the supports must leave the distance and cross on the horizon. More precisely, it would be so if the surface of the Earth would be a plane. But it is easy to make sure that it is not.
Instead, supports as the observer removed from the observer, it is beginning to deviate from a straight line and «dive» under the water on the horizon. This clearly demonstrates the curvature of the earth’s surface. I have been hearding absurd arguments that they say the supports are specially built in different heights to create such an illusion, but this argument is ridiculous. Moreover, anyone can make sure that this is not the case, for example, renting a boat or helicopter and rushing along the supports.
Such effect can also be observed on many rectilinear bridges over water flowing over the horizon. Another visual example is Turning Torso skyscraper in Malmo, Sweden, having a pronounced segmented structure.
The city of Malmo is located on one of the coast of the erection strait. Being on the other side of the Strait and moving along the shore, you can take a picture of this building from different distances. Enthusiasts more than once performed this simple experience.
Miraculously we see how the segments of a huge building gradually hide behind the horizon. So from a distance of 25 kilometers, 7 segments are seen (all of them eight), and at a distance of 48 kilometers — only 3, which also miraculously confirms the curvature of the earth’s surface.