#Martin_Luther_King_Jr's_Birthday__Martin_Luther_King_Day  observed on the Monday closest to January 15
  supertype:  #legal_holiday__national_holiday  authorized by law and limiting work or official business
  part of:  #January__Jan  the first month of the year; begins 10 days after the winter solstice
     part of:  #Gregorian_calendar__New_Style  the solar calendar now in general use, introduced by Pope Gregory XIII in 1582 AD to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752
     part of:  #winter__wintertime  the coldest season of the year

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