So explorers who have sailed around Antarctica or crosed it are mistaken? How high up is this dome and why haven’t aircraft or rockets encountered it?
Kartographer,
Sailors have sailed the perimeter. The voyage is approximately 60,000 miles, an unexpectedly large distance if the earth were a globe. Here are the references for sailors Cook (1773) and Ross (1839):
http://www.abodia.com/hoax/flat-earth/articles/flat-earth-around-antarticia.htm
I believe that the dimensions of the firmament (dome) give it a diameter of approximately 25,000 miles with a highest point at the North Pole.
We have, indeed, encountered the firmament:
Part 1
https://www.youtube.com/watch?v=54Ku3i-zl8U
The atomic bombs were detonated over Johnston Island in the Pacific Ocean. The highest detonation was at approximately 400 km (248 miles). From this datum we have a minimum height, but I believe that it is higher than 400 km.
Part 2
https://www.youtube.com/watch?v=sjFPWKgn-Gs
This video suggests that the dome may have a height of more than 1,000 km (620 miles) in some places.