Equator | Definition, Location, & Facts | Britannica
Calculation of Great Circle dist, initial and final course. Example #3 - YouTube
The Airline Pilots Forum and Resource
NSF, DOD partner to advance 5G technologies and communications for U.S. military, government and critical infrastructure operators | NSF - National Science Foundation
Great Circle Distance Formula - GeeksforGeeks
To find the initial and final course of great circle track Example 2 - YouTube