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Bottom Up Obstruction

The mainstream explanation for bottom-up obstruction is non sense and has never been substantiated. This phenomenon is entirely explicable through the principles of perspective, angular resolution, and optical effects on our flat plane. The apparent disappearance of objects from bottom to top as they recede is not due to any mythical "curvature," but rather the natural compression of angles near the ground and expansion above the eyeline. Our eyes have limits, folks! SO does every form of optics. The angular resolution of human vision, approximately 0.02° to 0.03°, determines what we can perceive at a distance. When you lower your observation point, the horizon appears closer, further compressing those bottom angles. It's all about perspective.... The so-called "setting" of the sun and moon? Nothing more than these celestial bodies reaching the vanishing point in our visual field, maintaining their size due to their high altitude and proximity the upper limit rather than the bottom one. Even on a flat Earth, there'd be a horizon - and it would look virtually identical to what we see now.