#month  a time unit of 30 days; "he was given a month to pay the bill"
  supertype:  #time_unit__unit_of_time  a unit for measuring time periods
  part:  #new_moon  #half-moon  #full_moon  #day (pm)
  part of:  #year
  subtype:  #lunar_month__moon__lunation__synodic_month__synodicmonth  the period between successive new moons (29.531 days)
  subtype:  #anomalistic_month  period between successive perigees; approximately 27.5546 days
  subtype:  #sidereal_month  period between successive conjunctions with a star, 27.322 days
  subtype:  #solar_month__solarmonth  one-twelfth of a solar or tropical year

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