#geocentric_parallax__diurnal_parallax__diurnalparallax  the parallax of a celestial body using two points on the surface of the earth as the earth rotates
  supertype:  #parallax  the apparent displacement of an object as seen from two different points that are not on a line with the object
  subtype:  #horizontal_parallax  the maximum parallax observed when the celestial body is at the horizon
  subtype:  #solar_parallax__solarparallax  the angle subtended by the mean equatorial radius of the Earth at a distance of one astronomical unit

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