#node.celestial_point  (astronomy) a point where an orbit crosses a plane
  supertype:  #celestial_point  a point in the heavens (on the celestial sphere)
  subtype:  #ascending_node__ascendingnode  the point at which an orbit crosses the ecliptic plane going north
  subtype:  #descending_node  the point at which an orbit crosses the ecliptic plane going south

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