[philman_36]

So what is north of Everest?

The vast elevated plain of the Tibetan Plateau

[philman_36]

Operation Highjump 1946-47
By the end of January, inclement weather had forced the airmen to skip over the existing gap between 150°E and 145°E longitude, which later expeditions would fill in. Mapping missions continued day after day covering a 1500-mile long area between 141°E and 115°E longitude.

That's 26° of longitude.

What is the distance between a degree of latitude and longitude?
A degree of longitude is widest at the equator at 69.172 miles (111.321) and gradually shrinks to zero at the poles. (because we live on a globe, right?) At 40° north or south the distance between a degree of longitude is 53 miles (85 km).

69.172 x 26 = 1798.472 at 0°.
53 x 26 = 1378 at 40° south YET...

From the link...since degrees of longitude are farthest apart at the equator and converge at the poles, their distance varies greatly.

So the article says they measured more miles closer to 66°, which by all accounts it should have been less, than they did at 40°?