#half-moon  the time at which the moon is at first or last quarter when half its face is illuminated
  supertype:  #phase_of_the_moon  a time when the moon presents a particular recurring appearance
  subtype:  #first_quarter  #last_quarter
  part of:  #month  a time unit of 30 days; "he was given a month to pay the bill"
     part of:  #year  a period of time occupying a regular part of a calendar year that is used for some particular activity; "a school year"

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