If case 1 is not true then try this:
Question 2:
Are A and B on each other’s anti-meridian?
Anti-meridians are two meridians exactly 180 degrees apart that connect a great circle around the globe.
Example:
A: 40N 120E
B: 10N 060W
–> Yes. They are on each other’s anti-=meridian because the longitudes have opposite signs (E and W) and they add up to 180 (120 + 60 = 180).
Solution:
You can now travel via the north pole or the south pole straight up or down, whichever is shorter.
![](https://rent-a-pilot.nl/wp-content/uploads/2022/08/PXL_20220824_122650487_cr-946x1024.jpg)
From 40N to the north pole is 50 degrees.
From 10N to the north pole is 80 degrees.
Total is 130 degrees.
– Great Circle distance = Total degrees x 60 NM = 130 x 60 = 7800 NM
– Track is north until passing the north pole, then it is south.