#parallax  the apparent displacement of an object as seen from two different points that are not on a line with the object
  supertype:  #optical_phenomenon__opticalphenomenon  a physical phenomenon related to or involving light
  subtype:  #heliocentric_parallax__annual_parallax  the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline
     subtype:  #stellar_parallax__stellarparallax  the heliocentric parallax of a star
  subtype:  #geocentric_parallax__diurnal_parallax__diurnalparallax  the parallax of a celestial body using two points on the surface of the earth as the earth rotates
     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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