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Absolutely no curvature of the earth can be seen. And the camera does a 360 turnaroundâ¦ The horizon is always at the eye-level. Logically, on a ball-earth, the horizon should be gradually lower as we go up in the air. The curvature of the earth should be seen far under 110 000 feets according to the Earth Globe theory. Open your eyes and see the evidence.
For the historical development of the concept, see Spherical Earth. Earth radius is the distance from the Earth's center to its surface, about 6,371 km (3,959 mi). This length is also used as a unit of distance, especially in astronomy and geology, where it is usually denoted by Râ. This article deals primarily with spherical and ellipsoidal models of the Earth.