#solar_calendar__solarcalendar  a calendar based on solar cycles
  supertype:  #calendar.organisation  a system of timekeeping that defines the beginning and length and divisions of the year
  subtype:  #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
     subtype:  #church_calendar__ecclesiastical_calendar  a calendar of the Christian year indicating the dates of fasts and festivals
  subtype:  #Julian_calendar__Old_Style  the solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus, establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February
  subtype:  #Revolutionary_calendar  the calendar adopted by The French First Republic in 1793 and abandoned in 1805; dates were calculated from Sept. 22, 1792

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