no altitude at all
As long as we are sniping at each other concerning measuring systems, levels of smartness (or needing brains?), or whatnot, I'll take a turn.
I looked at several pictures of the ALMA complex and did not observe any levitation. That is, the facility and all its components appear to be firmly attached to the earth. So the point is, whatever the measuring system of choice, ALMA is not at an "altitude" at all, but at an 'elevation' of some 5000 meters or 16000 feet. The paper airplane tossed out of the admin building is at an altitude of 5000 meters above seal level, until it smacks into the dirt.
Ok, I feel better now.
Carry on.
Biting the hand that feeds IT
