https://i.ytimg.com/vi/XFSo-ytQkTw/hqdefault.jpg Discussing with Nathan Oakley his new book and the fact that all Earth measurements like angles, azimuth, altitude, distance,…
https://i.ytimg.com/vi/KPr4r2Bn2As/hqdefault.jpg Whether at sea-level, the top of Mount Everest, or flying over a hundred thousand feet in the air, the…
