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Hipparchos of Nicaea Geodetic Reference System Coordinates, Method of Astronomy
Hipparchos or Hipparchus
* Nicaea, Bithynia [now Iznik, Turkey] c 120 BC
+ after 127 BC, Rhodes?
Greek astronomer and mathematician:
  • the first use of geographic coordinates (longitude/latitude) for describing geographic positions [Wells 1990].
  • Important prework to trigonometry using chords (german: "Sehnengeometrie")
  • Works on number theory
  • ...