>>13063283>Post your face when you realize that Euclid was a flat eartherThe Greeks knew the Earth was not flat at least since Aristotle and probably long before then. Aristarchus even knew the Earth revolves around the Sun, though almost nobody accepted his theory.
>Post your face when you realize that the entirety of basic geometry is based on a flat earth model of the universeIt is just a very good approximation on a small scale. Nobody even knows for sure what kind of geometry the universe has on the large scale.
>spherical trig is an oddball topic thats been almost completely ignored for the past 150 yearsTechnological advances made spherical trigonometry somewhat obsolete, but in our times of electronic warfare there is renewed interest in the subject. At the US Naval Academy in Annapolis, Maryland, they teach spherical trigonometry to officers in training. The idea is that GPS may be jammed (or GPS satellites may be shot down) and thus there would be a need to know how to navigate without any sophisticated technology, and spherical trigonometry is the best way to do that.
