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Text File  |  1992-09-03  |  329b  |  9 lines
  1. Half a great circle drawn on the Earth's
  2. surface passing through both poles and thus
  3. through all places with the same longitude.
  4. Terrestrial longitudes are usually measured
  5. from the Greenwich Meridian. An astronomical
  6. meridian is a great circle passing through
  7. the celestial pole and the zenith (the point
  8. immediately overhead).
  9.