#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
  supertype:  #solar_calendar__solarcalendar  a calendar based on solar cycles
  part:  #January  #February  #March  #April  #May  #June  #July  #August  #September  #October  #November  #December
  subtype:  #church_calendar__ecclesiastical_calendar  a calendar of the Christian year indicating the dates of fasts and festivals

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