Test inflation of the 100 ft. diameter PAGEOS satellite in a blimp hangar (1966). Once in orbit, it was tracked visually as part of an early experiment in global positioning. Sightings of the balloon satellite were used to pinpoint a position on the earth’s surface to within 96 feet. [2400 × 2400] via /r/spaceporn http://ift.tt/2ou3Hjc
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