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Lighthouse of Vlieland ( Netherlands ) seen from the afsluitdijk ( Den Oever) next to the statue of Dr Ir Cornelis Lely ( engineer of this project ) Distance from camera to lighthouse : 36,5 km . Camera height 9 mtrs ( dike is 7.5 meters plus the camera lens at 1.5 mtrs = 9 meters) , so the horizon is at 10,7 km. We will calculate the curvature of the earth over a distance of (36,5 minus 10,7 ) 25,8 km. Wiki says: sqrt(radius^2 + distance^2)-radius so the expected hidden part due to the curvature of the earth would be 52 mtrs. Wikipedia also states that the light itself( the part above the white 'ring') is at a height of 51 mtrs above sealevel. And this is where the problem begin : why do we still see the whole lighthouse of 17 meters while we would only have been able to see only the upper 5 meters of it , the part above the white 'ring 'where the actual light is? The whole lighthouse including the tower is 17 meters long and it stands on a high dune of 40 mtrs . A total of 57 meters of which 52 meters would have been invisible because of the alleged curvature of the earth. This vid is no direct proof of a flat earth , but it does show that this would be impossible on a ball earth with circumference of 40.000 km