#celestial_equator__celestialequator__equinoctial_circle__equinoctialcircle__equinoctial_line__equinoctialline__equinoctial  the great circle on the celestial sphere midway between the celestial poles
  supertype:  #great_circle__greatcircle  a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
  subtype:  #right_ascension  an arc of the celestial equator eastward from the vernal equinox

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