From 2002 – Mars over Cape Onion, the last time Mars was closest to earth in 2000 years.
Once you pass security and while you are in that secure zone. Are you actually nowhere? It seems like all the people there are in the same country and that it is not a country at all but rather an intercountry (I like calling it the Slipstream). Or maybe that is what Burroughs meant by the Interzone.