#lunar_calendar__lunarcalendar  a calendar based on lunar cycles
  supertype:  calendar.organisation  a system of timekeeping that defines the beginning and length and divisions of the year
  instance:  Roman_calendar
  subtype:  Muhammadan_calendar__Mohammedan_calendar__Moslem_calendar__Muslim_calendar  the lunar calendar used by Moslems; dates from 622 AD (the year of the Hegira); the beginning of the Moslem year retrogresses through the solar year completing the cycle every 32 years

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