In 1980 Hermes, one of these objects, came within 300,000 miles of the Earth
Although a satellite at an altitude of 100 nautical miles (NM) must maintain a ... 
With these two simple references--altitude and inclination--one can usefully ..... 
the low-altitude space station came of age in the late 1980s and is scheduled for
... [DOC] [TLE] Interpreting Objects and Collections [PAR] 1.