#equinox  either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
  supertype:  #cosmic_time  the time covered by the physical formation and development of the universe
  subtype:  #March_equinox__vernal_equinox__spring_equinox  March 21
  subtype:  #September_equinox__autumnal_equinox__fall_equinox  September 22

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