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This Concept Map, created with IHMC CmapTools, has information related to: Ref-obser, Research of influence on observation International latitude station Refraction and circumzenithal pairs, Research of influence on observation The large zenith distances Astronomical refraction, Research of influence on observation Different models of atmosphere Astronomical refraction, Research of influence on observation Refraction anomalies Time observations, Research of influence on observation About account refraction Astronomical supervision, Research of influence on observation Refraction anomalies Latitude observations