#winter_solstice  December 22, when the sun is at its southernmost point
  exclusion:  #summer_solstice
  supertype:  #solstice  either of the two times of the year when the sun is at its greatest distance from the celestial equator
  part of:  #winter__wintertime  the coldest season of the year

No statement uses or specializes #winter_solstice; click here to add one.