Originally Posted by Hyperveloce
...what is the average ground speed of this great circle trajectory ?
The following are the basic parameters compiled using the Vincenty Ellipsoid formulae:-
Start of track = 6.9752N 93.1072E, 172.4814T 131.144NM from VOCX
End of track = 29.8542S 98.4167E
Initial HDG = 172.3201T
Final HDG = 171.2092T
Dist = 4114660m 2221.739NM
Elapsed Time = 4.6405HRS - 4H 38M 26S
Ground Speed = 478.766KTS
Sorry about the "accuracy"
Someone else asked for positions crossing each ring. I'll calculate those when I get some time.
As I've previously said, the graphic is just speculation based on the ability to derive a GC track at around 0.84 Mach. With regard to the southward turn at 1830, I assume that any turn or climb taking place at that time could provide the apparent BFO change.