#solstice  either of the two times of the year when the sun is at its greatest distance from the celestial equator
  supertype:  #cosmic_time  the time covered by the physical formation and development of the universe
  subtype:  #summer_solstice__June_21__midsummer  June 21, when the sun is at its northernmost point
  subtype:  #winter_solstice  December 22, when the sun is at its southernmost point

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