@AndkonsReich @Shlomo @DoubleD Those graphics are all just to show the variation so a human eye can see it, the height variation is invisible to the human eye. Even the bulge at the equator is invisible to the human eye, when we zoom out its a regular sphere.
The reason why the path on the map curves like that is because of the flaws inherent in the mercator projection.
When reality is twisted to make a convenient 2D map, the path looks like that.