11.1N and 6.5N give latitudinal difference. Both are on the same hemisphere, i.e northern, so we subtract 11.1-6.5 to get 4.6. Had it been 11.1N and 6.5S, i.e. on opposite hemispheres, then we would have added them to get 17.6 Please, let me know if this helped 🙏
The Earth is not perfectly spherical, but we assume it is when calculating distances because it's a simple and close enough approximation. The Earth is actually a bit wider at the equator and flatter at the poles, but this difference is tiny and doesn't affect most calculations. Using a spherical model makes things easier and more understandable because it means the Earth's curvature is the same in all directions from any point.
@@KevinOchola "Deriving the equation would be a process" without that this is a video of watching you doing basic sums. Personally I found it a complete waste of time.
Sorry for that, but the question has been a problem to many that the approach I took helped convey the much needed steps in working it out. But still, understanding the equation will be time consuming, and yet it is just but a step in my working on this particular question. Just hold on, I will let you know when the video is ready. Thanks
