Why can't we see the curvature of the earth over many miles, but things disappear over the horizon after only a few miles? (due to the curvature?) - Quora
![trigonometry - How to calculate curvature of Earth per surface kilometer - Mathematics Stack Exchange trigonometry - How to calculate curvature of Earth per surface kilometer - Mathematics Stack Exchange](https://i.stack.imgur.com/Oi9bj.jpg)
trigonometry - How to calculate curvature of Earth per surface kilometer - Mathematics Stack Exchange
![File:Measurement of Horizon Drop comparing use of Pythagorean Theorem to 8 in per mile squared "rule".jpg - Wikimedia Commons File:Measurement of Horizon Drop comparing use of Pythagorean Theorem to 8 in per mile squared "rule".jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/2/29/Measurement_of_Horizon_Drop_comparing_use_of_Pythagorean_Theorem_to_8_in_per_mile_squared_%22rule%22.jpg/478px-Measurement_of_Horizon_Drop_comparing_use_of_Pythagorean_Theorem_to_8_in_per_mile_squared_%22rule%22.jpg)
File:Measurement of Horizon Drop comparing use of Pythagorean Theorem to 8 in per mile squared "rule".jpg - Wikimedia Commons
![Estimating Target Heights Based on the Earth Curvature Model and Micromultipath Effect in Skywave OTH Radar Estimating Target Heights Based on the Earth Curvature Model and Micromultipath Effect in Skywave OTH Radar](https://static-02.hindawi.com/articles/jam/volume-2014/424191/figures/424191.fig.004.jpg)