Significantly less than the 60mi of atmosphere he'll be looking through along the earth's horizon. thick but most of it, the densest part is within 10mi. It is known that we visually see the sun set long after it actually dipped below the horizon. Off hand as I understand it the ability to see objects further on the horizon is because of atmospheric refraction. In the world, there are many famous works that do not consider the curvature of the Earth when built, for example: the 193km long Suez Canal connecting the Atlantic and the Pacific (Figure 4), the Y-shaped Bridge 55km long the sea connecting Guangdong with Macau and Hong Kong (figure 5). If the Earth were indeed a globe, this would be completely impossible because it would have been "submerged" 626 meters deep due to the curved surface! Similar to Willis Tower in Chicago (USA) with a height of 442 m, we can still easily observe from a distance of 94km (see figure 3). If the Earth is indeed a globe, this is completely impossible because it has been "submerged" 720 meters deep due to the curved surface! The Statue of Liberty in New York (USA) has a height of about 100 m (326 feet), on clear blue days we can still easily observe it from a distance of 96 km (see figure 2). Thus, when going 60 miles (96 km), the object will reduce altitude by 720 m (0.45 miles). The formula is calculated as follows (see figure 1): When traveling a distance L, the object's position will be gradually reduced by an X-height due to the curved surface of the Earth. The radius of the globe is about 3959 miles (6371 km respectively).
The flat ground from a mathematical perspective:
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