Labels:lepton | person | rock | sky | tree | windowpane OCR: Mer D AN north -south reference line created by a great circle which passes through the poles of some object. terrestrial meridian the meridian which passes through the geographic poles of the earth, while magnetic is defined by a great circle which passes through the magnetic poles celestial meridian great circle of celestial sphere that goes through the celestial poles and the zenith the 'observer meridian" passes through the celestial poles and the observer zenith. soutn geogr
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